Instructions for creating plots of ion mask files:

The software to create plots of ion masks is in /export/data/tide/masks.

plot_ion_mask.pro is executed using the .run command.  It displays one mass and
one channel at a time with the option to interactively change either or both.
There is no hardcopy option.  gif and postscript files can only be created from
@mask_plot or @many_masks.


mask_plot is an IDL command file that executes ion_mask_plot.pro and 
ion_mask_main.pro.  It can display data for up to 4 masses and 7 channels at a 
time for a single mask file.  Use @mask_plot to run the software.
 
mask_plot issues the following prompts:

      mask filename => /datafiles/mask/t970317_v2.mask

      Enter the mass-to-charge ratio of up to 4 ions,
      enter -1 for singles, -2 for stops, enter 0 if mass not wanted,
      enter all 4 values on one line, separated by blanks.
 
      : 1 16 -2 0

      Enter up to 7 channels to plot, 0 if channel not wanted
      enter all 7 values on one line, separated by blanks.
 
      : 1 2 3 4 0 0 0
 
      Enter W to display in a window, P to create a postscript file,
      G to create a GIF file, or any combination of those letters.
      Output type: wpg
 
      Enter the name of a directory in which the program will write
      temporary files or press <Enter> to use your default directory.
      User directory: 
 
      Enter a unique tag to distinguish your temporary files or press
      <Enter> to ignore this option.

If the plot type is a display window, the following prompt must be answered 
before any other plots are created:

      Press 'q' to quit, any other key to continue
 
The only difference between mask_plot and many_masks is that many_masks runs
ion_mask_plot.pro and ion_mask_multi.pro which asks for the name of the file 
containing the list of masks to be plotted.  To create this file, use:

      ls /datafiles/mask/t96*mask > 96.list

many_masks is a quick way to survey a large number of mask files.

NOTE:  The postscript files can be 7 mbytes long when 4 masses and 7 channels
       are plotted.


view_gif.pro and view_many_gif.pro can be used to view exisiting gif files.
view_gif asks for the name of a single gif file, view_many_gif asks for the 
name of a file containing a list of the gif files to be viewed.  To create this
file use the command:

    ls t*gif > gif.list