NAME:
plot
PURPOSE:
plot the potential
INPUT:
t - time tp plot potential at
rmin - minimum R
rmax - maximum R
nrs - grid in R
zmin - minimum z
zmax - maximum z
nzs - grid in z
ncontours - number of contours
savefilename - save to or restore from this savefile (pickle)
OUTPUT:
plot to output device
HISTORY:
2010-07-09 - Written - Bovy (NYU)