Create a master sky image from a set of dithered NICMOS images.
CCD data processing
root - Root of observation set. This is usually a 6 character name, the
first 4 characters identify the proposal id and the last two
identify the visit.
OPTIONAL INPUT PARAMETERS:
KEYWORD INPUT PARAMETERS:
path - Directory where the images are read from. (default = current)
outpath - Directory where the final sky image is to be written to,
A FITS file is written to "outpath" with the name, root_.sky
where is replaced by the grism name as read from the header.
Note that you must have at least 3 images for a given grism for the
sky image to be created for that grism.
KEYWORD OUTPUT PARAMETERS:
Written by Marc W. Buie, Lowell Observatory, 1999 July 12
2004/9/21, MWB, removed obsolete call to Findfile