Detector

Some more tests were made to test the alignment of CCD #7 (the former ALFOSC CCD) that was installed a few months ago when one of the CCDs from the original mosaic failed. A direct comparison of the different CCDs show that CCD # 7 has a slight offset and tilt with respect to the average of the other CCDs, but the differences are similar to the tilts seen in the other 3 CCDs and the offsets between them. We, therefore, conclude that the CCD is fairly well aligned, but tests under very good seeing conditions are needed to see if small changes to the mounting of the detector cryostat might optimise the alignment of the whole mosaic a bit more.