[daip] AIPS/LION, problems with IMAGR 31DEC12 ?

[Eric Greisen]

Jose-Maria Torrelles wrote:
> Dear AIPS, do you know if AIPS 31DEC12 is working correctly within MAC Lion systems?
> We are producing images in two sites, Mexico and Barcelona. In Barcelona we have Snow Leopard working with AIPS 31DEC11 producing images
> with IMAGR without any problem. However in Mexico with Lion system and AIPS 31DEC12 we are obtaining images with completely different things. We know that the spectral channels we are managing
> have strong signal (masers), and in fact we are mapping without any problem those images using Snow Leopard and AIPS 31DEC11 in our mac computer in Barcelona.
> 
> As an example, I give you what IMEAN obtains from the image produced in Lion  (same input parameters) without seeing the signal:
> 
> 
> 1    5   03-JAN-2012  17:17:50     IMEAN     Image= SCHANEPOCH1 .ICL001. 303 1   xywind=    1    1 8192 8192
>    1    5   03-JAN-2012  17:17:50     IMEAN     Mean and rms found by fitting peak in histogram:
>    1    5   03-JAN-2012  17:17:50     IMEAN     Mean= 5.7710E-07 Rms= 6.0268E-03  **** from histogram
>    1    5   03-JAN-2012  17:17:50     IMEAN     Mean and rms found by including all data:
>    1    5   03-JAN-2012  17:17:50     IMEAN     Mean=-5.956E-08 Rms= 6.035E-03 JY/BEAM  over    67108864. pixels
>    1    5   03-JAN-2012  17:17:50     IMEAN     Flux density = -1.8959E-01 Jy.   beam area =  21.08 pixels
>    1    5   03-JAN-2012  17:17:50     IMEAN     Minimum=-3.6945E-02 at 8191 2673    1    1
>    1    5   03-JAN-2012  17:17:50     IMEAN     Skypos: RA 20 29 24.84505451  DEC 40 11 19.2190997
>    1    5   03-JAN-2012  17:17:50     IMEAN     Maximum= 3.3348E-02 at 1707    2    1    1
>    1    5   03-JAN-2012  17:17:50     IMEAN     Skypos: RA 20 29 24.90163955  DEC 40 11 18.9520000
>    1    5   03-JAN-2012  17:17:50     IMEAN     Skypos: IPOL  22236.429 MHZ
>    1    3   03-JAN-2012  17:17:50     IMEAN     Appears to have ended successfully
> 
   
> 1    5   03-JAN-2012  17:17:50     IMEAN     mac-pro- 31DEC12 TST: Cpu=      3.4  Real=      6  IO=       512
> 
> However, in our computer in Barcelona with Snow Leopard 31DEC11 (and also PC Linux) we obtain correct things with the maser at 1.7 Jy level seen:
> 
> 1    5   04-JAN-2012  10:18:48     IMEAN     Task IMEAN  (release of 31DEC11) begins
>   1    3   04-JAN-2012  10:18:48     IMEAN     Initial guess for PIXSTD taken from ACTNOISE inheader
>   1    3   04-JAN-2012  10:18:48     IMEAN     Initial guess for PIXAVG taken from ACTMEAN inheader
>   1    5   04-JAN-2012  10:18:52     IMEAN     Image= SCHANEPOCH1 .ICL001. 303 1   xywind=    1    1 8192 8192
>   1    5   04-JAN-2012  10:18:52     IMEAN     Mean and rms found by fitting peak in histogram:
>   1    5   04-JAN-2012  10:18:52     IMEAN     Mean= 8.5468E-07 Rms= 5.8542E-03  **** from histogram
>   1    5   04-JAN-2012  10:18:52     IMEAN     Mean and rms found by including all data:
>   1    5   04-JAN-2012  10:18:52     IMEAN     Mean= 2.129E-06 Rms= 6.012E-03 JY/BEAM  over    67108864. pixels
>   1    5   04-JAN-2012  10:18:52     IMEAN     Flux density =  6.7766E+00 Jy.   beam area =  21.08 pixels
>   1    5   04-JAN-2012  10:18:52     IMEAN     Minimum=-3.8377E-02 at 8191 2673    1    1
>   1    5   04-JAN-2012  10:18:52     IMEAN     Skypos: RA 20 29 24.84505451  DEC 40 11 19.2190997
>   1    5   04-JAN-2012  10:18:52     IMEAN     Maximum= 1.7877E+00 at 4335 5202    1    1
>   1    5   04-JAN-2012  10:18:52     IMEAN     Skypos: RA 20 29 24.87870534  DEC 40 11 19.4720001
>   1    5   04-JAN-2012  10:18:52     IMEAN     Skypos: IPOL  22236.429 MHZ
>   1    2   04-JAN-2012  10:18:52     IMEAN     returns adverbs to AIPS
>   1    3   04-JAN-2012  10:18:52     IMEAN     Appears to have ended successfully
> 
> In both sites, AIPS was installed with binaries.

31DEC12 is brand new and there should be little or no difference between 
the 2 versions depending on when the 31DEC12 was installed (or the most 
recent MNJ run).  I have changed some subroutines in ways that should 
have little or no impact on IMAGR.  We have seen no difficulties 
whatsoever with the transition from Snow Leopard to Lion  and in fact 
the load modules you are using on both computers are computed on a 
machine with an O/S not even as advanced as Snow Leopard.

There are so many things that can be different between the two 
executions of IMAGR (and even IMEAN) that I can tell very little from 
this alone.  One possibility would be if the IMAGR in Mexico was run 
with BMAJ < 0 which would leave a residual image without the components 
restored.

Try PRTCC on both machines to see if that gives similar results - an 
IMHEADER might also show interesting information.

Eric Greisen