MOPEX (MOsaicker and Point source EXtractor) is a package for reducing and analyzing imaging data, as well as MIPS SED data. MOPEX includes the point source extraction package, APEX.

MOPEX is designed to allow the user to:

• perform sophisticated background matching of individual data frames

• mosaic the individual frames downloaded from the Spitzer archive

• perform both temporal and spatial outlier rejection during mosaicking

• apply offline pointing refinement for MIPS data (refinement is already applied to IRAC data)

• perform source detection on the mosaics using APEX

• compute aperture photometry or PRF-fitting photometry for point sources

• perform interpolation, coaddition, and spectrum extraction of MIPS SED images.