Semion:  Please start with the data and images for filter 9.


FFOld_filterX.txt
these are the "old" flat field corrections for each filter. They are the same files as in the EPIC data processing, just as ASCII instead of binary.
Simple 2048 rows with 2048 columns each.
Note that the flat filed correction is multiplicative, i.e. a value of 1.0 means the pixel's value does not change due to the flat field correction.


FFOld_filterX.png
Those are the images corresponding to the old flat field data. Note that the image is presented like a matrix, i.e. the first row of the data is the top row in the image etc.


FFChange_filterX.txt
these are the retrieved changes that should be applied to the old flat field correction.
They are also multiplicative, i.e. a value of 1.0 means for this pixel there is not change relative to the old flat field correction.


FFChange_filterX.png
Those are the images corresponding to the flat field change data.
Note that the image shows the change in percent, i.e. when A are the values in the data, the image shows (A-1)*100.