Input to NICMOSlook

  Input to NICMOSlook is usually achieved from a dialog box on the user interface. The FITS files needed (direct and grism image) are expected to be in the NICMOS FITS format. That is a standard FITS file with 5 extensions containing the image data. If NICMOSlook encounters a FITS file with no extensions, it simply returns the single image as the science data and 4 images of equal size of zeroed data. Section B.1 describes this format in greater detail.