hydra> s3d_help;

  source3d.sl      version: 1.2.0 , 2010-05-10

  Routines available:

       General:  s3d_help, s3d_list_model,  variable: s3d_TITLE = NULL or <string>
       Spectra:  s3d_load[addin]_spectrum, 'list_spectra[um], '[o]plot_spectrum
 Foreground NH:  s3d_plot_nh, variable: s3d_NH22
    Components:  s3d_list_comps, 'list_comp, 'view_comps, 'proj_comps
                 s3d_ignore, s3d_notice
        Update:  s3d_update (and: 'update_nh, 'update_spec, 'update_comp)
    MC photons:  s3d_xray_photons (s3d_SHOW_NHARF_PLOT = 0,1)

      see also:  http://space.mit.edu/hydra/E2D_demo/e2d_demo.html
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