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The difference from algorithm #3 is quite minor; it starts to fill the intensity histogram in a quite narrow range relative to zero, but if the half of statistics is not found in this range it is extended by 1/4 of pixels (see parameter #3 below for initial guess for range of histogram). This iterations are repeated until the half of statistics is in the range, or the number of bins exceeds 10000. 

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1. (4) - algorithm number; 4 stands for this median algorithm,
2. (1) - type of regions for median algorithm; 3 regions (banks/rows/columns) for Epix100a, and 2 regions (banks/rows) for Fccd960
3. (30) - hint on common mode correction half-range initial guess for range of histogram (relative to 0) in ADU ,(see above description of intensity histogram).  This number can grow in subsequent iterations if half of the statistics is not found in this range.  It should probably start at around 3 sigma of the noise value.
4. (10) - maximal allowed absolute value of the common mode correction in ADU. If = 0 - no-limit is applied directly, indirect limit = 10000ADU (from limit on intensity histogram described above).

Other parameters are not used.

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