The three IDL procedures in this directory assist  in the reduction of UVOT
grism spectra.    The UVOT FTOOLS and CALDB must be installed
(http://heasarc.gsfc.nasa.gov/docs/software/lheasoft/download.html)  and the
environment variable CALDB defined to point to the main CALDB directory.

1. dogrism - A wrapper for UVOTIMGRISM that keeps track of the best default values

2. imgrism - Make an image display of the .pha spectrum files output by UVOTIMGRISM
       showing the source and background extraction regions, and a  co-aligned
       count plot.

3. grismspec - Extract a spectrum from a .pha file.   Unlike the default extraction
       uses a robust smoothing of the background, allows for use of either the
       upper or lower background, and allows a manual pixel shift of the
       (nonlinear) wavelength scale.
       
Also, included in this directory is a supporting procedure  dis2ave.pro, and a
needed procedure plotimage.pro from Craig Markwardt's library (  
http://astrog.physics.wisc.edu/~craigm/idl/idl.html)

The IDL Astronomy Library (http://idlastro.gsfc.nasa.gov ) must be installed.