Difference: CookBook2dfdr (6 vs. 7)

Revision 72007-01-30 - RonHeald

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CookBook for AAOmega data reduction with 2dfdr

AAOmega data is processed using a revised version of the 2dfdr software package. 2dfdr currently has modes which reduce data for a number of instruments including AAOmega with both the 2df and Spiral IFU top ends, 2dF, 6dF, FMOS and the older Spiral. In upgrading the software to work with AAOmega data a number of fundamental changes to the software have been required. At this time, the full 2dfdr manual

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Reduce any and all science frames
Combine the science frames

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The final step, the combination of the science frames, will, of course, fail if there is only one science frame. A Tcl bug means that the pop-up window which informs you of this currently crashes the reduction software. This will be fix as soon as possible. Your working directory should now contain a set of *red.fits files which are the reduced data. The combined data will be in the combined_frames.fits file if it was created.

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When the process is complete your working directory should contain a set of *red.fits files which are the reduced data, and the combined data will be in the combined_frames.fits file.

Note on extraction methods

There are currently three extraction options for AAOmega data, the option can be set under the Extract tab on the main GUI window:

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Tram - a simple summation of the data either side of the tram line fit. This is quick, but a little noisy
Gauss - a weighted summation of the data based on the predicted Gaussian PSF either side of the tram line fit
Fit - a full PSF fitting of the data, which takes into account fibre-to-fibre cross talk fully.

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TRAM - a simple summation of the data either side of the tram line fit. This is quick, but a little noisy
GAUSS - a weighted summation of the data based on the predicted Gaussian PSF either side of the tram line fit
FIT - a full PSF fitting of the data, which takes into account fibre-to-fibre cross talk fully.

Ultimately Fit extraction will give the best results, although the fitting process is rather slow. At this time however, the FIT routine has not been correctly implemented and we suggest you use Tram extraction for a quick look reduction and Gauss extraction for science.

Known problems

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Release notes: There are two outstanding issues with the new 2dfdr implementation. Both are related to the use of STARLINK libraries and are currently under review.

1. The software will not run correctly if the path to the executables is to long (greater than 40 characters). The error means that 2dfdr will appear to start okay, but on attempting to plot data the system will report that it cannot find the xwindow to display to.

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Note for users using Linux: You may have problems trying to reduce data on SUN/Solaris disks running 2dfdr under Linux: 2dfdr may simply fail giving an error message like this: "Task drexec2 has crashed while executing an action" This seems to be a problem related to accessing data over NFS between SUN and Linux machines. We don't have a solution for this, but the workaround is to copy the data to a local Linux disk, and reduce from there.

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-- RonHeald - 29 Jan 2007

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-- RonHeald - 30 Jan 2007

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META FILEATTACHMENT	attr="" autoattached="1" comment="2dfdr Main GUI" date="1168487622" name="2dfdr_gui.jpg" path="2dfdr_gui.jpg" size="85650" user="Main.RonHeald" version="1"

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