The files w?_psfs.tar.gz, one for each band, are gzipped tar files
that contain FITS format images of the WISE Single-exposure PSFs.
These are the PSF templates that have been used for all NEOWISE data
processing.


When decompressed and unpacked, each file contains 162 FITS files that
are the PSFs templates and uncertainty maps for each WISE band.  The
WISE focal planes are subdivided into a 9x9 grid of equal areas.  The
grid elements, specified in the names of the file (e.g. 01x01, 01x02,
etc), indicate the segment of the Single-exposure image to which a
particular PSF corresponds.  Element 01x01 corresponds to the lower
left corner of the images, in pixel space.  There are PSF template and
uncertainty maps for each grid element.

The PSF template and uncertainty map file names have the form:

wise-w[1,2]-psf-wpro-09x09-XXxYY.fits     
wise-w[1,2]-psfunc-wpro-09x09-XXxYY.fits

where [1,2] indicates the WISE band and XXxYY indicates the x-y coordinate
of the 9x9 grid element.