The following list outlines the Nastran outputs available through the AIM interface.

EigenValue = List of Eigen-Values ( $\lambda$ ) after a modal solve.
EigenRadian = List of Eigen-Values in terms of radians ( $\omega = \sqrt{\lambda}$ ) after a modal solve.
EigenFrequency = List of Eigen-Values in terms of frequencies ( $f = \frac{\omega}{2\pi}$ ) after a modal solve.
EigenGeneralMass = List of generalized masses for the Eigen-Values.
EigenGeneralStiffness = List of generalized stiffness for the Eigen-Values.