Name: GRAFMP  24
The routine GRAFMP plots a geographical axis system.
The call is:  CALL GRAFMP (XA, XE, XOR, XSTP, YA, YE, YOR, YSTP)
         or:  void grafmp (
                     float xa, float xe, float xor, float xstp, 
                     float ya, float ye, float yor, float ystp);
XA, XE        are the lower and upper limits of the X-axis.
XOR, XSTP     are the  first X-axis label  and the step  between
              labels.
YA, YE        are the lower and upper limits of the Y-axis.
YOR, YSTP     are the  first Y-axis label  and the step  between
              labels.
Notes:      - GRAFMP  must be  called  from level 1 and sets the
              level to 2.
            - The axes  must  be linear and scaled in  ascending
              order.  In general, X-axes must be scaled  between
              -180 and 180 degrees and Y-axes between -90 and 90
              degrees.
            - For  elliptical  projections,  the plotting  of an
              axis system will be suppressed.  This will also be
              done for azimuthal projections with YE - YA > 90.
            - The statement  CALL GRIDMP (I, J) overlays an axis
              system with a grid of longitude and latitude where
              I and J  are the number  of grid lines between la-
              bels in the X- and Y-direction.
Name: GRIDMP  24
The routine GRIDMP overlays an  axis system with a longitude and
latitude grid.
The call is:  CALL GRIDMP (I, J)                   level 1, 2, 3
         or:  void gridmp (int i, int j);
I, J          are the number of grid lines between labels in the
              X- and Y-direction.
Name: XAXMAP  24
The routine XAXMAP plots a secondary X-axis.
The call is:  CALL XAXMAP (A, B, OR, STEP, CSTR, NT, NY) level 2
         or:  void xaxmap (float a, float b, float or, 
                  float step, const char *cstr, int nt, int ny);
A, B          are the lower and upper limits of the X-axis.
OR, STEP      are the first label and the step between labels.
CSTR          is a character string containing the axis name.
NT            indicates how ticks, labels  and the axis name are
              plotted.  If NT = 0, they are plotted  in a clock-
              wise direction.  If NT = 1,  they are plotted in a
              counter-clockwise direction.
NY            defines the horizontal  position  of the X-axis. A
              secondary  axis  must be located  inside  the axis
              system.
Name: YAXMAP  24
The routine YAXMAP plots a secondary Y-axis.
The call is:  CALL YAXMAP (A, B, OR, STEP, CSTR, NT, NX) level 2
         or:  void yaxmap (float a, float b, float or, 
                  float step, const char *cstr, int nt, int nx);
A, B          are the lower and upper limits of the Y-axis.
OR, STEP      are the first label and the step between labels.
CSTR          is a character string containing the axis name.
NT            indicates how ticks,  labels and the axis name are
              plotted.  If NT = 0,  they are plotted in a clock-
              wise direction.  If NT = 1,  they are plotted in a
              counter-clockwise direction.
NX            defines  the  vertical  position  of the Y-axis. A
              secondary  axis  must be  located  inside the axis
              system.
Name: PROJCT  24
The routine PROJCT selects the geographical projection.
The call is:  CALL PROJCT (CTYPE)                        level 1
         or:  void projct (const char *ctype);
CTYPE         is a character string defining the projection.
  = 'CYLI'    defines a cylindrical equidistant projection.
  = 'MERC'    selects the Mercator projection.
  = 'EQUA'    defines a cylindrical equal-area projection.
  = 'HAMM'    defines the elliptical projection of Hammer.
  = 'AITO'    defines the elliptical projection of Aitoff.
  = 'WINK'    defines the elliptical projection of Winkel.
  = 'SANS'    defines the elliptical Mercator-Sanson projection.
  = 'CONI'    defines a conical equidistant projection.
  = 'ALBE'    defines a conical equal-area projection (Albers).
  = 'CONF'    defines a conical conformal projection.
  = 'AZIM'    defines an azimuthal equidistant projection.
  = 'LAMB'    defines an azimuthal equal-area projection.
  = 'STER'    defines an azimuthal stereographic projection.
  = 'ORTH'    defines an azimuthal orthographic projection.
  = 'MYPR'    defines a user-defined projection.
                                        Default: CTYPE = 'CYLI'.
Notes:      - For cylindrical equidistant projections,  the sca-
              ling parameters in GRAFMP must be in the range:
                         -540 <= XA <= XE <= 540
                         -180 <= YA <= YE <= 180
              For Mercator procektions:
                         -540 <= XA <= XE <= 540
                         - 85 <= YA <= YE <=  85
              For cylindrical equal-area projections:
                         -540 <= XA <= XE <= 540
                         - 90 <= YA <= YE <=  90
              For elliptical projections:
                         -540 <= XA <= XE <= 540
                            XE - XA <= 360
                         - 90 <= YA <= YE <=  90
              For conical projections:
                         -540 <= XA <= XE <= 540
                            0 <= YA <= YE <=  90  or
                         - 90 <= YA <= YE <=   0
              For azimuthal projections with  YE - YA > 90,  the
              hemisphere around the map pole is projected onto a
              circle. Therefore,  the hemisphere can be selected
              with the map pole. The plotting of the axis system
              will be  suppressed.
              If YE - YA <= 90, the part of the globe defined by
              the  axis scaling  is projected  onto a rectangle.
              The map pole will be set by GRAFMP to  ((XA+XE)/2,
              (YE+YA)/2).  The scaling parameters must be in the
              range:
                         -180 <= XA <= XE <= 180 and
                                 XE -  XA <= 180
                         - 90 <= YA <= YE <=  90
          -   For all projections except the default projection,
              longitude and latitude coordinates will be projec-
              ted  with the same scaling factor  for the X-  and
              Y-axis.  The scaling factor is  determined  by the
              scaling of the  Y-axis  while the  scaling  of the
              X-axis  is used  to centre the map.  The longitude
              (XA+XE)/2  always lies  in the centre  of the axis
              system.
Name: WORLD   24
The routine  WORLD plots coastlines  and lakes or political bor-
ders.  Coastlines  and lakes  are plotted by default,  political 
borders can be enabled with the routine MAPOPT.
The call is:  CALL WORLD                                 level 2
         or:  void world ();
Name: SHDMAP  24
The routine SHDMAP plots shaded continents.
The call is:  CALL SHDMAP (CMAP)                         level 2
         or:  void shdmap (const char *cmap);
CMAP          is a character string defining the continent.
  = 'AFRI'    means Africa.
  = 'ANTA'    means the Antarctic.
  = 'AUST'    means Australia.
  = 'EURA'    means Europe and Asia.
  = 'NORT'    means North America.
  = 'SOUT'    means South America.
  = 'ALL'     means all continents.
  = 'SEA'     means that oceans and lakes are shaded.
  = 'LSEA'    means that oceans and lakes are shaded, where
              'gshhs_l.b' is used for sea shading.
  = 'ISEA'    means that oceans and lakes are shaded, where
              'gshhs_i.b' is used for sea shading.
  = 'HSEA'    means that oceans and lakes are shaded, where
              'gshhs_h.b' is used for sea shading.
  = 'LAND'    means that all land is shaded without lakes.
  = 'GSHL'    means that 'gshhs_l.b' is used.
  = 'GSHI'    means that 'gshhs_i.b' is used.
  = 'GSHH'    means that 'gshhs_h.b' is used.
Note:         Shading patterns  can be selected with  SHDPAT and
              MYPAT except for 'SEA' and 'LAND' shading, where a
              solid shading is used. Colours can be defined with
              COLOR and SETCLR.
Name: SHDAFR  24
The routine SHDAFR plots shaded African countries.
The call is:  CALL SHDAFR (INRAY, IPRAY, ICRAY, N)   level 2
         or:  void shdafr (const int *inray, const long *ipray, 
                           const int *icray, int n);
INRAY         is an integer array containing the countries to be
              shaded. INRAY can have the following values:

        1: Algeria           19: Gabon          37: Nigeria
        2: Angola            20: Gambia         38: Ruanda
        3: Benin             21: Ghana          39: Senegal
        4: Botswana          22: Guinea         40: Seychelles
        5: Burkina Faso      23: Guinea Bissau  41: Sierra Leone
        6: Burundi           24: Kenya          42: Somalia
        7: Cameroon          25: Lesotho        43: South Africa
        8: Central Afr. Rep. 26: Liberia        44: Sudan 
        9: Chad              27: Libya          45: Swaziland
       10: Comoros           28: Madagascar     46: Tanzania
       11: Congo, Dem. Rep.  29: Malawi         47: Togo        
       12: Congo, Rep.       30: Mali           48: Tunisia
       13: Cote d'Ivoire     31: Mauritania     49: Uganda
       14: Djibouti          32: Mauritius      50: West Sahara
       15: Egypt             33: Morocco        51: Zambia 
       16: Equatorial Guinea 34: Mozambique     52: Zimbabwe
       17: Eritrea           35: Namibia       
       18: Ethiopia          36: Niger           0: Africa
IPRAY         is an integer array containing shading patterns.
ICRAY         is an integer array containing colour numbers.
N             is the number of countries to be shaded.
Name: SHDASI  24
The routine SHDASI plots shaded Asiatic countries.
The call is:  CALL SHDASI (INRAY, IPRAY, ICRAY, N)       level 2
         or:  void shdasi (const int *inray, const long *ipray,
                           const int *icray, int n);
INRAY         is an integer array containing the countries to be
              shaded. IRAY can have the following values:

    1: Afghanistan     19: Jordan         37: Saudi Arabia  
    2: Armenia         20: Kazakhstan     38: Sri Lanka  
    3: Azerbaijan      21: Korea (North)  39: Singapore 
    4: Bangladesh      22: Korea (South)  40: Spratly  
    5: Bhutan          23: Kuwait         41: Syria 
    6: Brunei          24: Kyrgyzstan     42: Taiwan 
    7: Burma           25: Laos           43: Tajikistan  
    8: Cambodia        26: Lebanon        44: Thailand 
    9: China           27: Malaysia       45: Turkey 
   10: Emirates        28: Maldives       46: Turkmenistan
   11: Gaza            29: Mongolia       47: Uzbekistan
   12: Georgia         30: Nepal          48: Vietnam
   13: India           31: Oman           49: Westbank  
   14: Indonesia       32: Pakistan       50: Yemen 
   15: Iran            33: Paracel       
   16: Irak            34: Philippines   
   17: Israel          35: Qatar        
   18: Japan           36: Russia          0: All
IPRAY         is an integer array containing shading patterns.
ICRAY         is an integer array containing colour numbers.
N             is the number of countries to be shaded.
Name: SHDAUS  24
The routine SHDAUS  plots shaded countries of Australia and Oce-
ania.
The call is:  CALL SHDAUS (INRAY, IPRAY, ICRAY, N)       level 2
         or:  void shdaus (const int *inray, const long *ipray,
                           const int *icray, int n);
INRAY         is an integer array containing the countries to be
              shaded. INRAY can have the following values:

    1: Australia       6: Nauru            11: Solomon  
    2: Fiji            7: New Caledonia    12: Tonga  
    3: Kiribati        8: New Zealand      13: Tuvalu 
    4: Marshall        9: Papua New Guinea 14: Vanuatu
    5: Micronesia     10: Samoa             0: All
IPRAY         is an integer array containing shading patterns.
ICRAY         is an integer array containing colour numbers.
N             is the number of countries to be shaded.
Name: SHDEUR  24
The routine SHDEUR plots shaded European countries.
The call is:  CALL SHDEUR (INRAY, IPRAY, ICRAY, N)       level 2
         or:  void shdeur (const int *inray, const long *ipray,
                           const int *icray, int n);
INRAY         is an integer array containing the countries to be
              shaded. INRAY can have the following values:
             1: Albania         17: Luxembourg    33: Belarus
             2: Andorra         18: Malta         34: Bosnia 
             3: Belgium         19: Netherlands   35: Croatia
             4: Bulgaria        20: North Ireland 36: Czech 
             5: Germany         21: Norway        37: Estonia
             6: Denmark         22: Austria       38: Latvia
             7: Cyprus          23: Poland        39: Lithuania
             8: United Kingdom  24: Portugal      40: Macedonia
             9: Finland         25: Romania       41: Moldavia
            10: France          26: Sweden        42: Russia
            11: Greece          27: Switzerland   43: Serbia         
            12: Ireland         28: Spain         44: Slovakia
            13: Iceland         29: CSFR          45: Slovenia
            14: Italy           30: Turkey        46: Ukraine
            15: Yugoslavia      31: USSR          47: Kosovo
            16: Liechtenstein   32: Hungary       48: Montenegro
                                                   0: Europe
IPRAY         is an integer array containing shading patterns.
ICRAY         is an integer array containing colour numbers.
N             is the number of countries to be shaded.
Name: SHDNOR  24
The routine  SHDNOR  plots shaded countries of North and Central
America.
The call is:  CALL SHDNOR (INRAY, IPRAY, ICRAY, N)       level 2
         or:  void shdnor (const int *inray, const long *ipray, 
                           const int *icray, int n);
INRAY         is an  integer array containing the  states to  be
              shaded.  INRAY  can have  the following values:
       1: Alaska           13: El Salvador  25: Nicaragua
       2: Antigua, Barbuda 14: Greenland    26: Panama
       3: Bahamas          15: Grenada      27: Puerto Rico
       4: Barbados         16: Guadeloupe   28: St. Kitts, Nevis
       5: Belize           17: Guatemala    29: St. Lucia
       6: British Virgin   18: Haiti        30: St. Vincent
       7: Caiman Islands   19: Honduras     31: Trinidad
       8: Canada           20: Jamaica      32: USA
       9: Costa Rica       21: Martinique      
      10: Cuba             22: Mexico        0: All 
      11: Dominica         23: Montserrat      
      12: Dominican Rep.   24: Neth. Antilles
IPRAY         is an integer array containing shading patterns.
ICRAY         is an integer array containing colour numbers.
N             is the number of states to be shaded.
Name: SHDSOU  24
The routine SHDSOU plots shaded states of South America.
The call is:  CALL SHDSOU (INRAY, IPRAY, ICRAY, N)       level 2
         or:  void shdsou (const int *inray, const long *ipray,
                           const int *icray, int n);
INRAY         is an  integer array containing the  states to  be
              shaded. INRAY  can have  the following values:
         1: Argentina    6: Ecuador         11: Suriname
         2: Bolivia      7: French Guyana   12: Uruguay
         3: Brazil       8: Guyana          13: Venezuela
         4: Chile        9: Paraguay         
         5: Colombia    10: Peru             0: All
IPRAY         is an integer array containing shading patterns.
ICRAY         is an integer array containing colour numbers.
N             is the number of states to be shaded.
Name: SHDUSA  24
The routine SHDUSA plots shaded USA states.
The call is:  CALL SHDUSA (INRAY, IPRAY, ICRAY, N)       level 2
         or:  void shdusa (const int *inray, const long *ipray,
                           const int *icray, int n);
INRAY         is an  integer array containing the  states to  be
              shaded. INRAY  can have  the following values:
            1: Alabama     19: Maine          37: Oregon 
            2: Alaska      20: Maryland       38: Pennsylvania
            3: Arizona     21: Massachusetts  39: Rhode Island
            4: Arkansas    22: Michigan       40: South Carolina
            5: California  23: Minnesota      41: South Dakota
            6: Colorado    24: Mississippi    42: Tennessee
            7: Connecticut 25: Missouri       43: Texas
            8: Delaware    26: Montana        44: Utah
            9: Florida     27: Nebraska       45: Vermont 
           10: Georgia     28: Nevada         46: Virginia
           11: Hawaii      29: New Hampshire  47: Washington
           12: Idaho       30: New Jersey     48: West Virginia
           13: Illinois    31: New Mexico     49: Wisconsin
           14: Indiana     32: New York       50: Wyoming
           15: Iowa        33: North Carolina 51: Washington DC 
           16: Kansas      34: North Dakota   
           17: Kentucky    35: Ohio           
           18: Louisiana   36: Oklahoma        0: USA
IPRAY         is an integer array containing shading patterns.
ICRAY         is an integer array containing colour numbers.
N             is the number of states to be shaded.
Name: MAPIMG  24
The routine MAPIMG  plots a BMP  or  GIF raster image to an axis
system.  Some parameters  which describe the location, scale and
rotation of  the map  are passed to  MAPIMG. The parameters have
the  same  meaning  as  the attributes of the  ESRI  World  File 
Format.   
The call is:  CALL MAPIMG (CFIL, X1, X2, X3, X4, X5, X6) level 2
         or:  void mapimg (const char *cfil float x1, float x2, 
                        float x3, float x4, float x5, float x6); 
CFIL          is a character string that  contains the name of a
              BMP or GIF file.
X1            is the  pixel size in the X-direction in map units
              per pixel.
X2            is the rotation about the Y-axis.
X3            is the rotation about the X-axis.
X4            is the  pixel size in the Y-direction in map units
              per pixel.  This  value  is  normally  a  negative 
              number.
X5            is the  X-coordinate  of  the  centre of the upper
              left pixel.
X6            is the  Y-coordinate  of  the  centre of the upper
              left pixel.
Name: CURVMP  24
The routine  CURVMP  plots curves  through data points  or marks
them with symbols.
The call is:  CALL CURVMP (XRAY, YRAY, N)                level 2
         or:  void curvmp (const float *xray, const float *yray,
                                                         int n);
XRAY, YRAY    are real arrays containing the data points.
N             is the number of data points.
Notes:      - CURVMP  is similar to  CURVE  except  that  only a
              linear interpolation can be used.
            - In general, a line between two points on the globe
              will not be projected as  a straight line.  There-
              fore,  CURVMP interpolates lines linearly by small
              steps.  An alternate plotting mode can be set with
              MAPMOD.
Name: MAPBAS  24
The routine MAPBAS defines the map data file used in the routine
WORLD. An internal DISLIN map file, some external map files com-
piled by Paul Wessel and map files in Mapgen format can be used.
The map  files  compiled by  Paul Wessel  can be copied  via FTP 
anonymous from the servers

   ftp://ftp.ngdc.noaa.gov/MGG/shorelines/
   ftp://kiawe.soest.hawaii.edu/pub/wessel/gshhs/

The external map files 'gshhs_l.b', 'gshhs_i.b', 'gshhs_h.b' and
'gshhs_f.b' must be copied to the map subdirectory of the DISLIN
directory.

Map files in  Mapgen format  are  available  from the  Coastline
Extractor:

   http://rimmer.ngdc.noaa.gov/

The call is:  CALL MAPBAS (CBAS)                      level 1, 2
         or:  void mapbas (const char *cbas);
CBAS          is a character string defining the map data file:
 = 'DISLIN'   defines the DISLIN base map.
 = 'GSHL'     defines 'gshhs_l.b' as base map.
 = 'GSHI'     defines 'gshhs_i.b' as base map.
 = 'GSHH'     defines 'gshhs_h.b' as base map.
 = 'GSHF'     defines 'gshhs_f.b' as base map.
 = 'MAPFIL'   defines an external map file  as base map  that is
              specified with the routine MAPFIL.
                                      Default:  CBAS = 'DISLIN'.
Name: MAPFIL  24
The routine  MAPFIL  defines  an external map file. The map file
can be used as base map if the routine MAPBAS is called with the
parameter 'MAPFIL'.
The call is:  CALL MAPFIL (CFIL, COPT)                level 1, 2
         or:  void mapfil (const char *cfil, const char *copt);
CFIL          is a character string  containing the filename  of
              the external map file.
COPT          is a character string describing the format of the
               map coordinates. COPT can have the values 'GSHHS'
              and 'MAPGEN'.
Name: MAPLEV  24
The routine  MAPLEV  defines land, lake or river coordinates for
WORLD  if the external map files  from  Paul Wessel are used.
The call is:  CALL MAPLEV (COPT)                      level 1, 2
COPT          is a  character string  that  can have  the values
              'BOTH',  'LAND', 'LAKE' and 'RIVERS'.  The keyword
              'BOTH' means 'LAND' and 'LAKE'. 
              If  COPT = 'RIVERS',  the  WDB  rivers distributed 
              with the GSHHS coordinates are plotted.
                                        Default:  COPT = 'BOTH'.
Name: MAPPOL  24
MAPPOL defines the map pole used for azimuthal projections.
The call is:  CALL MAPPOL (XPOL, YPOL)                   level 1
         or:  void mappol (float xpol, float ypol);
XPOL, YPOL    are the longitude and latitude  coordinates in de-
              grees where:
                         -180 <= XPOL <= 180 and
                         - 90 <= YPOL <=  90
                                               Default: (0., 0.)
Note:         For an  azimuthal  projection with  YE - YA <= 90,
              the map pole will be set by GRAFMP to  ((XA+XE)/2,
              (YA+YE)/2).
Name: MAPSPH  24
For an azimuthal projection with YE - YA > 90, DISLIN  automati-
cally projects a hemisphere around the map pole on a circle. The
hemisphere can be reduced using MAPSPH.
The call is:  CALL MAPSPH (XRAD)                         level 1
         or:  void mapshd (float xrad);
XRAD          defines the region  around the map pole  that will
              be projected onto a circle (0 < XRAD <= 90).
                                             Default: XRAD = 90.
Name: MAPREF  24
The routine MAPREF defines,  for conical projections,  two lati-
tudes where the cone intersects or touches the globe.
The call is:  CALL MAPREF (YLW, YUP)                     level 1
         or:  void mapref (float ylw, float yup); 
YLW, YUP      are the lower and upper latitudes where:
                      0 <= YLW <= YUP <= 90     or
                   - 90 <= YLW <= YUP <=  0
                           Default:  YLW = YA + 0.25 * (YE - YA)
                                     YUP = YA + 0.75 * (YE - YA)
Note:         YLW and YUP can have identical values and lie out-
              side of the axis scaling.
Name: MAPLAB  24
The routine  MAPLAB enables axis system labels for azimuthal and
elliptical projections.

The call is:  CALL MAPLAB (COPT, CKEY)                level 1, 2

COPT          is a character string that can contain the options
              'NONE', 'LEFT', 'RIGHT' and 'BOTH'.  
CKEY          is  a  character  string  containing  the  keyword
              'LATITUDE'.
                                  Default: ('NONE', 'LATITUDE').
Name: MAPMOD  24
The routine  MAPMOD determines how data points will be connected
by CURVMP.
The call is:    CALL MAPMOD (CMODE)                level 1, 2, 3
         or:    void mapmod (const char *cmode);
CMODE           is a  character  string  defining the connection
                mode.
  = 'STRAIGHT'  defines straight lines.
  = 'INTER'     means that lines will be interpolated linearly.
  = 'GREAT'     means Great Circle interpolation.
                                      Default:  CMODE = 'INTER'.
Name: MAPOPT  24
The routine  MAPOPT  enables  political  borders  plotted by the
routine  WORLD,  or sets  an option  to adjust the length of the
X-axis to the scaling.
The call is:  CALL MAPOPT (COPT, CKEY)                level 1, 2
         or:  void mapopt (const char *copt, const char *ckey);
COPT          is a character string containing an option.
CKEY          is a character string containing a keyword:
 = 'WORLD'    If  CKEY = 'WORLD',   COPT  can  have  the  values 
              'COAST',  'BORDERS'  and 'BOTH'. The default value
              is COPT = 'COAST'.
 = 'XAXIS'    If  CKEY  = 'XAXIS',  COPT  can  have  the  values
              'STANDARD' and 'AUTO'. Normally, longitude and la-
              titude coordinates will be projected with the same
              scaling factor  where the scaling factor is deter-
              mined by the scaling of the Y-axis while  the sca-
              ling  of the  X-axis  is used to centre  the  map.
              For  COPT = 'AUTO',  DISLIN  tries the  change the
              length of the X-axis, so that the axis length cor-
              responds to the scaling  parameters in  GRAFMP for
              the X-axis.  
              The default value is COPT = 'STANDARD'.  
Name: POS2PT  24
The routine POS2PT converts map coordinates to plot coordinates.
The call is:  CALL POS2PT (XLONG, YLAT, XP, YP)       level 2, 3
         or:  void pos2pt (float xlong, float ylat, 
                                        float *xp, float *yp); 
XLONG, YLAT   are the map coordinates in degrees.
XP, YP        are the plot coordinates calculated by POS2PT.
Name: X2DPOS  24
The funtion X2DPOS converts map coordinates to plot coordinates.
The call is:  XP  = X2DPOS (XLONG, YLAT)              level 2, 3
         or:  float x2dpos (float xlong, float ylat);
XP            is the plot coordinate calculated by X2DPOS.
XLONG, YLAT   are the map coordinates in degrees.
Name: Y2DPOS  24
The funtion Y2DPOS converts map coordinates to plot coordinates.
The call is:  YP  = Y2DPOS (XLONG, YLAT)              level 2, 3
         or:  float y2dpos (float xlong, float ylat);
YP            is the plot coordinate calculated by Y2DPOS.
XLONG, YLAT   are the map coordinates in degrees.
Name: PT2POS  24
The routine PT2POS is the inverse routine to POS2PT and converts
plot coordinates to map coordinates. The plot coordinates should
be located in the current axis system.
The call is:  CALL POS2PT (XP, YP, XLONG, YLAT)          level 2
XP, YP        are the plot coordinates.
XLONG, YLAT   are the map coordinates calculated by PT2POS.
Name: SETCBK  24
The routine SETCBK defines a user written callback routine.
The call is:  CALL SETCBK (ROUTINE, 'MYPR')     level 0, 1, 2, 3
         or:  void setcbk (void (*routine) (float *x, float *y),
                                                        "MYPR");
ROUTINE       is the name of a  routine  defined by the user. In
              Fortran, the routine must be declared as EXTERNAL.
