Task eprejectti is intended to be run immediately after task epframes, either in the PPS or alternatively as part of the offline analysis using the epchain script.
The epchain task parameters runeprejectti, sigma, badcolumnset, noiseparameters,and screenrejected are available to control the behavior of eprejectti and the subsequent event filtering. Care should be taken that parameter screenlowthresh is set to a sufficiently low value (120 eV) to preserve the noise-screened low energy events in the final calibrated event set. A typical epchain call to run eprejectti would look like this (see epchain task description for other epchain parameters):
epchain runeprejectti=yes ...
After running epchain, a noise screened low energy image may, e.g., be created by the following call
evselect expression='PHA>20 && PI in (120:200)' ...
Note, that events with PHA values below 20 need to be removed to create a clean image.
