MODION : a graphical tool composed of IDL widgets for creating an approximate
and simplified model of the energy Levels and transitions of an atom/ion.
Written by F.Varosi, T.Lanz, A.Dekoter, I.Hubeny, S.Heap, at NASA/Goddard 1995.

Requires as input the files generated by TOPBASE to get energy Levels,
gf-values of lines, and photoionization cross-sections.
Modeling work in progress is stored in IDL/XDR save/restore files.
The results of MODION can be output in formats which are read by
the stellar atmosphere models of Lanz, Hubeny, and Dekoter.

For more information contact:	LANZ@stars.gsfc.nasa.gov
or:  varosi@gsfc.nasa.gov

To install MODION:

	ftp  idlastro.gsfc.nasa.gov
	user: ftp
	pass: (anything)

	ftp> cd pub/contrib/varosi
	ftp> bin
	ftp> get modion-install.tar	(this has everything in it)

	% tar xvf modion-install.tar	(creates files in new sub-dir)
	% cd install.modion		(change to newly created dir)
	% install_modion		(does all of the installation)

Edit the file ~/install.modion/idl_setup to setup your environment.
Then  "source  ~/install.modion/idl_setup"  sets the environment variables
and defines the alias  "modion" which you can enter at your system prompt.
If you exit back to IDL>, then enter "modion" to start again.
Instead of the alias you could: "cd ~/modion",
execute idl,  and at IDL> prompt type "modion".
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To later upgrade MODION to new release, ftp as above and get the files:

		modion.tar.Z	(the MODION specific IDL code)

		vlib.tar.Z	(Varosi's general purpose IDL code library)

	place them in directory install.modion (was created by install_modion),
	and then you have following options:

	to overwrite current code:

		% untar		# executes shell script to install code.

	or, to move current code into dirs ~/modion/old_code and ~/idl/old_vlib
	and install new code:

		% newcode

	or, to revert back to "old_code" and "old_vlib":

		% oldcode
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