Header keywords in the merged SOFI images

[ekankare]

When reducing the SOFI imaging data, I have encountered 3 issues with the header keywords in the merged final images.

1. Compared to the old pipeline version 2.2.2 the new version 2.2.6 (and 2.2.4 and 2.2.5) is not writing in the image header of the merged SOFI images the following header keywords:

ASSON1 ASSOC1 TELAPSE TMID NTCRPIX1 NTCRPIX2 NUSTEP NCOMBINE NOFFSETS NJITTER PROG_ID OBSTECH REFERENC PROCSOFT OBID1 FILTER DATAMAX DATAMIN DETRON EFFRON QUALITY BUNIT PRODCATG PIXSCALE

I think that the single images are correct.

2. The description of GAIN in the merged images is not correct:

GAIN = 14.4 / Total integration time of all exposures (s)

Single images are correct.

3. This is more of a question. What I can see is that in the version 2.2.2 reductions the following keywords were deleted from the header of the merged images. In the new versions of the pipeline these keywords remain. Is there a reason why these keywords are kept? They seem to cause the WCS not to display correctly when the merged images are viewed with Starlink Gaia. In ds9 the WCS is fine.
   PC1_1 = 0.000000 / Translation matrix element
   PC1_2 = 1.000000 / Translation matrix element
   PC2_1 = -1.000000 / Translation matrix element
   PC2_2 = 0.000000 / Translation matrix element

[svalenti]

This was a bug when merging the images that was stoping the update of all headers. it should be fixed now