NAME:
Ez
PURPOSE:
calculate the vertical energy
INPUT:
t - (optional) time at which to get the vertical energy
pot= Potential instance or list of such instances
vo= (Object-wide default) physical scale for velocities to use to convert
use_physical= use to override Object-wide default for using a physical scale for output
OUTPUT:
vertical energy
HISTORY:
2013-11-30 - Written - Bovy (IAS)