AIPS HELP file for SY2TY in 31DEC22
As of Thu Mar 23 7:45:56 2023
SY2TY: Task to convert EVLA SY table data to a TY table
INNAME Image name(name).
INCLASS Image name(class).
INSEQ 0.0 9999.0 Image name(seq. #). 0=>high
INDISK Disk drive #. 0=>any
INVERS 0.0 46655.0 Model Fit version number
OUTVERS 0.0 46655.0 STar file version number.
Use: SY2TY reads EVLA SY and CD tables and writes a TY table
Note that the SY table must be used to calibrate EVLA data, Tsys
alone will not suffice. The raw "visibilities" from the EVLA
Binary Data Format are not normalized correlation coefficients
so they are not amplitude calibrated by scaling by Tsys. In
fact the scaling is sqrt (Tsys/Psum) of antenna 1 times sqrt
(Tsys/Psum) of antenna 2. Psum and Pdif can have jumps in them
which scale out perfectly in Tsys but affect the raw
"visibilities" as well. This makes TYAPL needed to calibrate
visibility by visibility rather than an interpolated calibration
(SN table) such as is done in APCAL.
INNAME......Image name (name). Standard defaults.
INCLASS.....Image name (class). Standard defaults.
INSEQ.......Image name (seq. #). 0 => highest.
INDISK......Disk unit #. 0 => any.
INVERS......Version number of SY table to be translated to TY.
OUTVERS.....Version number of TY table created.
0 => highest+1.