6 Displaying reconstructed images

A ‘white-light’ image will be created from the datacube with the suffix _im by compressing the datacube over its entire wavelength range. Other images can be automatically extracted from the datacube by creating a file in the $ORAC_DATA_OUT directory with the filename extract.images. Each line of this file should contain the desired suffix for the file containing the image (without the underscore) and either two or four wavelengths (in microns). If a line contains two wavelengths then an image will be extracted from the cube between those wavelengths. If four wavelengths are given then two images will be extracted and the second will be subtracted from the first. Any lines beginning with # are ignored.

To display these images you will need to edit the disp.dat file. Copy it from the calibration directory to the current reduced data directory using

Images with the suffix _im will be displayed automatically. For all other images you need to add a line to the disp.dat file. The easiest way of doing this is to use a programme called oracdisp. Alternatively you can edit the file directly adding a line which looks like this:

See SUN/230 for more details on configuring the Orac-dr display system.

Images with the suffix _im will be kept, but all other images will be deleted at the end of processing as ‘intermediate files’. If you include an entry in your extract.images file with a suffix of im then this will be extracted and kept instead of the white light image over the entire wavelength range.

Please note that at present images displayed by Orac-dr will be compressed by a factor of two in the $x$ direction due to the non-square ($0.24\times 0.12$ arcsec) pixels of the IFU. The axes should be correctly labelled with arcsec offsets from the centre of the field. Images can be displayed with the correct aspect ratio by running the Kappa display routine with the options xmagn=2 ymagn=1 specified on the command line.