Deleting calibration tables

[ryd010]

Hello,

I am reducing 5.5 GHz data from last week, the start of which was compromised by unstable weather. On the first reduction pass of the primary and secondary calibrators, it became apparent I should flag the earlier data. So I deleted the first-pass calibrations as per http://www.atnf.csiro.au/computing/soft ... ode91.html

i.e.
miriad% delhd in=1934-638.5500/gains
DELHD: Version 1.0 25-Apr-94
miriad% delhd in=1934-638.5500/leakage
DELHD: Version 1.0 25-Apr-94
miriad% delhd in=1934-638.5500/bandpass
DELHD: Version 1.0 25-Apr-94
miriad% delhd in=j0700-6610.5500/gains
DELHD: Version 1.0 25-Apr-94
miriad% delhd in=j0700-6610.5500/leakage
DELHD: Version 1.0 25-Apr-94
miriad% delhd in=j0700-6610.5500/bandpass
DELHD: Version 1.0 25-Apr-94

then started again from mfcal. When I got to checking the new calibration of j0700.5500 using

unset "line select xrange yrange"
blflag vis=j0700-6610.5500 device=/xs stokes=xx,yy axis=chan,amp options=nofqav,nobase

I was startled to see the following:

blflag.png (77.12 KiB) Viewed 5130 times

Not the ~1 Jy I was expecting. On further examination I found the j0700-6610.5500 directory contained 2 additional files I've not come across before, a "gainsf" and a "leakagef" file. After deleting these and the other 6 cal files and restarting the calibration process, the above plot came out with the expected ~1 Jy in all channels. What are these "gainsf" and "leakagef" files, and should they be added to the list of files to be removed in "Deleting Calibration Tables - DELHD" section of the user manual?

Cheers,

Stuart Ryder

[ste616]

Hi Stuart,

These are the frequency-dependent gain and leakage tables, which are generated by gpcal if you specify nfbins to be anything higher than 1.

Yes, they should be mentioned in the section of the manual you identified - thanks for the suggestion!

[Mark.Wieringa]

Hi Stuart,

Yes, you should remove these files as well and the manual should be updated, thanks for alerting us to this.
The gainsf and leakagef files are created when you use the nfbin parameter with a value >1.
They contain the frequency dependent solutions (1 per bin) for gain and leakage.
Whenever they are present, they are applied when requesting calibrated data.

Cheers,

Mark

PS Jamie beat me to it again..

[ryd010]

Thanks guys for the prompt feedback.

Cheers,

Stuart