NAME:
  occstrip
 PURPOSE:   (one line only)
  Generate a postage stamp strip of images for an occultation
 DESCRIPTION:
 CATEGORY:
  Occultation
 CALLING SEQUENCE:
  occstrip,dir,x,y,xhw,yhw,i1,i2
 INPUTS:
  dir - String, name of the directory where the data files can be found.
           This directory will be searched for files ending in .fits.
           The file lits is accessed in normal directory sorting order.
  x   - x pixel location of center of ROI to extract
  y   - y pixel location of center of ROI to extract
  xhw - half-width of ROI in x direction
  yhw - half-width of ROI in y direction, total width is 2*hw+1
  i1  - first image to extract ROI from  (0 is the first file in the list)
  i2  - last image to extract ROI from
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
 OUTPUTS:
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Southwest Research Institute, 2020/04/06