[daip] Issue with FLATN (AIPS 2023) {External}

[Arti Goyal]

Dear colleague,

I have text installed AIPS 2023 on my Macbook Pro and it’s running smoothly. I am encountering a problem while running the task FLATN. Here I want to interpolate 25 fields into one as I have performed a wide-field imaging (610 MHz data from GMRT telescope in India).  The problem is that the task starts but doesn’t finish no matter how long I let take and I need to abort to get the terminal back. The resulting FLATNed image is junk without any intensities.

##
LOCALH> FLATN1: Task FLATN  (release of 31DEC23) begins
LOCALH> FLATN1: Create HDFN        .FLATN .   1 (MA)  on disk  1  cno  361
LOCALH> FLATN1: Field     1 included blc,trc   253  2247   773  2767
LOCALH> FLATN1: ZABORS: signal 15 received
LOCALH> FLATN1: ABORT!

##
The image header of the FLATNed image:

AIPS 1: Got(1)   disk= 1  user= 100   type=MA   HDFN.FLATN.1
AIPS 1: Image=HDF-N     (MA)         Filename=HDFN        .FLATN .   1
AIPS 1: Telescope=GMRT               Receiver=GMRT
AIPS 1: Observer=TOM                 User #=  100
AIPS 1: Observ. date=01-APR-2007     Map date=04-SEP-2024
AIPS 1: Pixel type: FLOATING         Magic value blanking
AIPS 1: Minimum= 1.00000002E+20      Maximum=-1.00000002E+20 JY/BEAM
AIPS 1: ----------------------------------------------------------------
AIPS 1: Type    Pixels   Coord value      at Pixel    Coord incr   Rotat
AIPS 1: RA---SIN  3000    12 36 49.403515  1500.00        -1.380    0.00
AIPS 1: DEC--SIN  3000    62 12 57.973953  1501.00         1.380    0.00
AIPS 1: FREQ         1   6.1737502E+08        1.00  1.375000E+07    0.00
AIPS 1: STOKES       1   1.0000000E+00        1.00  1.000000E+00    0.00
AIPS 1: ----------------------------------------------------------------
AIPS 1: Coordinate equinox 2000.00
AIPS 1: Map type=NORMAL              Number of iterations=    2413
AIPS 1: Conv size=   7.08 X   5.92   Position angle=  28.46
AIPS 1: Rest freq      0.000         Vel type: RADIO   wrt YOU
AIPS 1: Alt ref. value  0.00000E+00  wrt pixel    0.45
AIPS 1: Keyword = 'WTNOISE '  value =  1.13333679D+00
AIPS 1: Keyword = 'SUMWTIN '  value =  1.42178117D+08
AIPS 1: Keyword = 'CCFLUX  '  value =  2.569658E-02
AIPS 1: Keyword = 'CCTOTAL '  value =  1.265699E+00
AIPS 1: Keyword = 'MAXABSU '  value = -1.000000E+00

##
My box file for creating 25 fields is as below:


F 1    512 512  1380   1380

F 2    512 512   690   1380

F 3    512 512  0      1380

F 4    512 512   -690   1380

F 5    512 512   -1380  1380

F 6    512 512  1380   690

F 7    512 512  690    690

F 8    512 512  0       690

F 9    512 512   -690    690

F 10   512 512   -1380   690

F 11   512 512  1380   0

F 12   512 512   690   0

F 13   512 512   0 0

F 14   512 512   -690   0

F 15   512 512   -1380  0

F 16   512 512  1380  -690

F 17   512 512   690  -690

F 18   512 512   0     -690

F 19   512 512   -690  -690

F 20   512 512   -1380 -690

F 21   512 512  1380  -1380

F 22   512 512  690   -1380

F 23   512 512   0    -1380

F 24   512 512  -690  -1380

F 25   512 512  -1380 -1380

##
I will greatly appreciate any help in this regard.

Thank you.

Arti Goyal

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listmgr.nrao.edu/pipermail/daip/attachments/20240905/e87ee6d9/attachment-0001.html>