[Comm2011] Dark current taken tonight

[helmich]

Tonight 3x1hr darks were observed, here are the results.

Dark current for CCD 91 is off the scale (negative) -0.07
ADU/pixel/hr.

I'm not sure how that happens: each dark frame is bias subracted, but
each of our biases and each dark is also overscan corrected. Well,
it's negligible anyway.

Regards,

Ewout 
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