# HOW-TO View the contents of a photometric association catalog¶

The first processing step in the photometric pipeline always consists of extracting source catalogs from the standard field data, and associating the results with a standard star catalog. These particular ‘association’ catalogs are represented in the system by PhotSrcCatalog objects. To view the content of a PhotSrcCatalog object, simply invoke its inspect method:

awe> photcat.inspect()


which will result in an output to screen that looks like the one shown in the figure below. The inspect plot shows the magnitudes of the individual standard stars as known to the standard star catalog on the x-axis, and their associated raw zeropoints on the y-axis.