GPS Command Example 12:

/gps/particle geantino
/gps/pos/type Volume
/gps/pos/shape Ellipsoid
/gps/pos/centre 2. 2. 2. cm
/gps/pos/halfx 2. cm
/gps/pos/halfy 3. cm
/gps/pos/halfz 4. cm
/gps/ang/type iso
/gps/ene/type Pow
/gps/ene/min 2. MeV
/gps/ene/max 10. MeV
/gps/ene/alpha 0.

Resulted Distribution Plots: