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Actally h0ughy I lied. The darks were taken at -10.7C and the light was at -12.3C hence the residual after subtraction. I just could not be bothered to do the darks again. Just shows how important it is to take darks at exactly the same temperature as lights. Thats why I swear By ICNR. I was manually controlling the fridge temperature. I am in the process of designing an electronic version. Pulse width modulation of one of the Peltiers should control the temperature adequately without any major sawtoothing. Peltiers also have a nasty property that if you lower the current you get a DROP in temperature for a delta time and then it rises again.
Bert
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