CORSRCS is a character string instructing the correlator staff where to get the source coordinates. STANDARD will imply to get them from the correlator catalog. This is an extensive list of sources based on USNO geodetic/astrometric solutions or, for sources for which VLBI positions are not known, from the VLA calibrator list. SCHEDULE will mean to get the positions from those used in this schedule. Other statements can be made - this information will be read by the correlator operations staff. If more room is needed, see the CORNOTE parameters.