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David, Rhys Morris is having trouble with some FITS-WCS headers. The file is at ftp://andromeda.star.bris.ac.uk/pub/star/data/2336+56_ha-r_mosaic.fit Attempting, e.g. to draw a grid over it in GAIA doesn't work, and if you look at the reported RA values when moving the cursor over different parts of the image you can see that it gets pretty confused. DS9 coordinate readout appears to be sensible, though again trying to plot a grid gives an AST error. If I remove (well, rename) the card PV2_3 = 220. / then the WCS looks fine, though I don't know whether it's correct or not. I don't know what the PVi_j cards are supposed to do. Can you comment on whether this is broken FITS-WCS (which I expect is the case), or a problem in AST, or something else, and/or speculate about what the file's author meant to say? thanks Mark -- Mark Taylor Astronomical Programmer Physics, Bristol University, UK [log in to unmask] +44-117-928-8776 http://www.star.bris.ac.uk/~mbt/