Specifying PCENTERS followed by a "/" causes SCHED to read groups of phase centers for use with multiple-phase center processing on the DiFX correlator. This is much like the reading of in-line catalogs with SRCCAT or STACAT. Each specified group has a name specified with NAME and a list of source names specified with SOURCES. All of these sources should be in the source catalogs. It will be common to use a file, specified with SRCFILE2 to specify all the ``sources'' used as phase centers.
After the last phase center group, a line with ENDCENT / should be given to return SCHED to reading normal program input. There is an example egcent.key that demonstrates the capability. The main effect will be the listing of the phase centers