Program name: sim.pro
Program directory: ~dd/irt/sim
Program Language: IDL with IRT ray-trace routines

Program brief description:

	This is a complete ray-trace of the Source-HRMA-HETG-ACIS.

Program operation/example:
	cd ~dd/irt/sim
	s_idl		(only needed once per window login)
	idl
(c_flight is run to reset parameters for Capella and MEG)
	sim			(this runs the program)
	analyze, 0.4, 2.0	(this does a simple analysis of the image)
(Change to just a single line:)
	sm_spectfile = 's_oneline'
	sim
	all3prof	(show the profiles of the -1, 0, +1 orders
				 images from the MEG.)

Other features: