Keywords: mrtcal-prog-manual

Next: IMB-FITS version 2.13 Up: Patching IMB-FITS at read Previous: Added elements when missing Contents

# Modified elements

- `IFCENTER`, `FRQOFF1`, and `FRQOFF2` columns from the FrontEnd table are reversed for each row where `IFFLIPS` is true. This factorizes the sign issues when dealing with IF2 instead ot IF1,
- The column `BAND` is read under the name `PART` for IMB-FITS version lower than 2. Same for `REC1` and `REC2` read under the names `RECEIVER` and `BAND` respectively,
- `REFCHAN` is patched to correct values (instead of 1) when dealing with continuum backend (1 channel per chunk),
- all the BackEnd columns, namely `PART`, `REFCHAN`, `CHANS`, `DROPPED`, `USED`, `PIXEL`, `RECEIVER`, `BAND`, `POLAR`, `REFFREQ`, `SPACING`, and `LINENAME` are sliced into memory to more values than from the file in order to factorize at once the `MSET CALIBRATION BANDWIDTH` tuning. `NAXIS2` is updated accordingly. See section for details,
- the columns `MJD`, `INTEGTIM` and `ISWITCH` are compressed if `MSET CALIBRATION BAD` is `NO` (this is the default). In this case all rows where `ISWITCH` is 0 are removed. Two new columns `FOREPOIN` and `BACKPOIN` are added as cross pointers between the original and compressed columns. See section for details.
- the `DATE-OBS` and `DATE-END` stamps of each subscan are patched if `MSET CALIBRATION MJDINTER` is `YES`. See HELP for details.

Next: IMB-FITS version 2.13 Up: Patching IMB-FITS at read Previous: Added elements when missing Contents