The gain is derived from a set of paired flat fields with identical
exposure time, using the Photon Transfer Curve (PTC) method. Since
2013-08-01, flats covering the full dynamic range are taken into account,
also flats already in the non-linear regime, for which the PTC is not
corrected for. A smaller slope in the PTC results in higher gain values.
For more information see the plot
Click on any of the plots to see a close-up version.
The latest date is indicated on top of the plot, data points belonging to that date are specially marked.
statistical averages are indicated by a solid line, and thresholds by broken lines
outliers are marked by a red asterisk. They are defined as data points outside the
"aliens" (= data points outside the plot Y limits) are marked by a red arrow (↑ or ↓)
you can download the data for each parameter set if the 'Data downloads' link shows up