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Changes between Version 28 and Version 29 of Background_Dark_Model

v28	v29
2	2	== April 4, 2012 ==
3	3
4		To determine the date ranges we should use the A/B mode darks, I processed OTA67 darks over the entire range of usable dates. All darks were selected to be 30s exposures that were either the 2nd or 7th of that night's sequence. I then measured the slopes as done previously, and used this slope as the proxy to determine the dark quality and which dark is the best fit. The following plot summarizes this data, along with a set of bars indicating the current time range of various active darks.
	4	To determine the date ranges we should use the A/B mode darks, I processed OTA67 darks over the entire range of usable dates. All darks were selected to be 30s exposures that were either the 2nd or 7th of that night's sequence. I then measured the slopes in the residual image as done previously, and used this slope as the proxy to determine the dark quality and which dark is the best fit. The following plot summarizes this data, along with a set of bars indicating the current time range of various active darks.
5	5
6	6	The red points show the slopes allowing detselect to choose the current appropriate model. As we have no new models valid for data prior to 2010-01-23 (as the headers prior to that date have a different keyword for the detector temperature), these data are only fit with their default models. The large slopes and scatter in this data suggest new darks would be useful for this older data.