OrbitPlot is a graphics program written in IDL for displaying curtain plots (height vs.  
latitude) of HIRDLS atmospheric constituents from two HIRDLS HDFEOS swath files and 
the difference between these two files.  An option exists to replace the difference   
plot with a third plot from a third HDFEOS file.
1.  Of course you will need to have an IDL license to run OrbitPlot
2.  More documentation is in the top of OrbitPlot.pro
3.  What follows is how OrbitPlot was configured on hir1:
    a. The 'public' OrbitPlot.pro is in /usr/local/sw/idl/OrbitPlot.pro
    b. OrbitPlot the python script is in /usr/local/sw/bin
    c. the .input file is in your local directory where you run OrbitPlot
    d. the HDFEOS files (two of them) can be anywhere
    e. locally written IDL support code (get_aura.pro,vfnd.pro,tvp.pro,
        tvpp.pro,plot_xsect2.pro,plot_xsectp.pro) in /usr/local/sw/idl
4. Command for running OrbitPlot in a unix batch run is:  OrbitPlot -i file.input
    This will run the public one in /usr/local/sw/idl.  If you have your own version 
    in your local directory where you are running OrbitPlot, then the same
    above command will run your local version.
5. Command for running in an IDL interactive mode is:  .run OrbitPlot.pro.
    Range limits in the python script will have to be interactively entered!
6. Option to put plots in a postscript file (PS) or to the screen (X) or png (Z)
7. Command to create the orbitplot tar file executed within /hir1/ckrinsky/orbitplot/archive
    tar -cvzf OrbitPlot.tgz *