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### Calculate River Csim X

Since GREAT-ER calculates a distibution of concentrations per stretch (based on the Monte-Carlo simulation) this menu item enables users to calculate any percentile from the distribution of C sim, internal. The model results are considered as log-normal distributed. After specifying a percentile (the unit is per cent, hence the specified value must be greater than 0 and less than 100) the values will be derived per stretch and a new field will be added to the results table. After calculation a new theme is displayed in the scenarios view, entitled "`Csim xx [unit]`". The colouring is the same as that used for the mean values.

The analysis methods mentioned below are possible for either the default C sim, internal mean values or a derived percentile.