Setting the pixelsize to a value in arcseconds
If you are setting the reproject_image_grid pixelsize parameter to a value in arcseconds, you have to specify it when the tool is run, not via pset.
A feature in the CIAO parameter interface causes double quotes (") to be converted to single quotes (') when they are written to the parameter file:
unix% pset reproject_image_grid pixelsize='1"' unix% pget reproject_image_grid pixelsize 1'
Supplying the pixelsize on the command line when the tool is run ensures that the value will be correctly interpreted as arcsec, e.g.
unix% reproject_image_grid pixelsize='1"' Input image file name (@expmaps.lis): .. etc. ..
The value is also correctly recorded in the history of the output file:
unix% dmhistory sn1006_expmap.fits reproject_image_grid reproject_image_grid infile="@list_of_expmaps.lis" outfile="sn1006_expmap.fits" xsize="2500" ysize="2500" xcenter="225.7" ycenter="-41.9" theta="0" pixelsize="1"" projection="tan" resolution="1" method="average" coord_sys="world" lookupTab="/soft/ciao/data/dmmerge_header_lookup.txt" clobber="yes" verbose="0"