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Arne, Kato-san, The comments (below) regarding the obvious difficulties and dangers of dealing with low S/N data leads me to raise the question as to what you consider to be the S/N value below which an expert's input is advisable? As a relative newcomer in CCD photometry I have followed this discussion with great interest, so all expert advise is most appreciated. Regards Bernard Heathcote > There is no software package that I know of, including my own, > that does not have problems when you are dealing with low signal/noise > situations. This is a very tricky regime and I am willing to bet > that what works for one case will not work for another. You should > avoid low signal/noise regimes until you are experienced. If > it is important to use the low signal/noise data, then it is > best to have an expert, such as Kato-san, reduce all of the original CCD > frames rather than using results from many different observers and > reduction procedures.
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