The cal values are stored in files at ao in the directory: /pkg/rsi/local/libao/phil/data . ... cal.datR5 - lbw . ... When users download the ao idl routines, the cal files are included in the directory ./dat . ... D1,D2: there are 2 diodes. 1 diode can feed both polarization or each diode can feed a separate pol. corcal: diode 1 feeds both polA and polB . ... xcal : cross over. diode 1 feeds polB, diode 2 feeds polA . ... Each column has the value for 1 of the diodes feeding polA or polB. ... col 4 . ...