SRCCAT is a flag to indicate that the following inputs are to be treated as an in-line source catalog. See Section 3.2 for details of source catalog contents. The catalog input is terminated by ENDCAT / to resume schedule input. It is best to specify SRCCAT / as a separate line not part of other SCHED keyin input. SCHED stores the source catalog information in internal arrays which have a maximum size that may depend on the computer but is 500 in the distributed version. All sources found in in-line catalogs are stored in these arrays because they may be read before all scheduled sources are known. In contrast, when an external source catalog is read, only scheduled sources are kept. See the examples in Section B.3 for illustrations of how in-line source catalogs are used.
If SRCCAT is found, the end of the input group (everything up to the ``/'') is not considered the end of inputs for this file. The next inputs after the source data are entered will continue to apply to the current file (usually the first).