[daip] Problem with BPASS

[Eric Greisen]

Kitty Lo wrote:
> Hi,
> 
> I am using the aips task BPASS for bandpass calibration and I 
> encountered a kind of bizarre problem.
> 
> This is the situation:
> The first time I ran BPASS I realised I put in the wrong parameters and 
> just lazily ctrl-C out of AIPS and restarted aips again. Then I realised 
> it was in the middle of writing to a scratch file which appeared so I 
> used ZAP to delete it.
> After that, no matter what I do, it keeps thinking I have some flags in 
> my data, which I did the first time I ran BPASS.
> I deleted the entire FG extension table, and still when I run BPASS, it 
> gives me this output:
> 
> platyp> BPASS1: Task BPASS  (release of 31DEC08) begins
> platyp> BPASS1: Bandpass table (amp & phase) will be normalized
> platyp> BPASS1: Weights in solution will be channel-dependent
> platyp> BPASS1: Doing no flagging this time
> platyp> BPASS1: Selecting the data
> platyp> BPASS1: Dividing the spectral data by channel 0
> platyp> BPASS1: BPCOPY: copied      7020 vis records for bandpass fitting
> platyp> BPASS1: Determining solutions
> platyp> BPASS1: Writing BP table    3
> platyp> BPASS1:  Time=   0/ 06 48 50 IFs=  1 -   8  Chann=   1 -   64 
> Polzn=ALL
> platyp> BPASS1: BASOLV:   63 flagged channels in IF  1
> platyp> BPASS1: BASOLV:   38 flagged channels in IF  1
> platyp> BPASS1: BASOLV:   64 flagged channels in IF  3
> platyp> BPASS1: BASOLV:   64 flagged channels in IF  3
> platyp> BPASS1: BASOLV:   64 flagged channels in IF  4
> platyp> BPASS1: BASOLV:   64 flagged channels in IF  4
> platyp> BPASS1: BASOLV:   63 flagged channels in IF  5
> platyp> BPASS1: BASOLV:   64 flagged channels in IF  5
> platyp> BPASS1: BASOLV:   26 flagged channels in IF  6
> platyp> BPASS1: BASOLV:   36 flagged channels in IF  6
> platyp> BPASS1: BPSOL: wrote   14 records to the BP table
> platyp> BPASS1: Appears to have ended successfully
> 
> And this is what imhe shows, there is no FG table:
> 
> AIPS 1:            FREQSEL  SOURCE  INTTIM  WEIGHT  SCALE
> AIPS 1: ----------------------------------------------------------------
> AIPS 1: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
> AIPS 1: COMPLEX      1   1.0000000E+00       1.00  1.0000000E+00    0.00
> AIPS 1: STOKES       4  -1.0000000E+00       1.00 -1.0000000E+00    0.00
> AIPS 1: FREQ        64   8.1000000E+08       1.00 -1.5625000E+05    0.00
> AIPS 1: IF           8   1.0000000E+00       1.00  1.0000000E+00    0.00
> AIPS 1: RA           1    05 42 36.136       1.00       3600.000    0.00
> AIPS 1: DEC          1    49 51 07.230       1.00       3600.000    0.00
> AIPS 1: ----------------------------------------------------------------
> AIPS 1: Coordinate equinox 2000.00
> AIPS 1: Maximum version number of extension files of type SU is   1
> AIPS 1: Maximum version number of extension files of type AN is   1
> AIPS 1: Maximum version number of extension files of type HI is   1
> AIPS 1: Maximum version number of extension files of type TY is   1
> AIPS 1: Maximum version number of extension files of type GC is   1
> AIPS 1: Maximum version number of extension files of type CL is   1
> AIPS 1: Maximum version number of extension files of type SN is   1
> AIPS 1: Maximum version number of extension files of type FQ is   1
> AIPS 1: Maximum version number of extension files of type NX is   1
> AIPS 1: Maximum version number of extension files of type BP is   3
> 
> Any suggestions? Where does the flagged channels come from and how can I 
> unflag it?


It looks from here as if these channels have been permanently flagged - 
did you copy the data set with UVCOP and apply a flag table?

Try POSSM to plot the data (aparm(9) = 1 to show all IFs on one plot)
or UVPRT to look at some channel etc etc

Eric Greisen