Examples:

XSPEC> steppar 2 0.5 1. 4 3 1. 2. 4  ! Create a 55 grid for
                                       parameters 2 and 3

XSPEC> plot contour                  ! Plot out a grid with three contours with
                                       delta fit statistic of 2.3, 4.61 and 9.21

XSPEC> plot cont,,4,1.,2.3,4.61,9.21 ! same as above, but with a delta fit
                                       statistic = 1 contour.