Setup environment

ssh pslogin
ssh psananeh

1. or psanafeh for cxi, sxr, and mec
   cd <your-directory>
   sit_setup

Pedestals

Configuration file for psana with name for example: ana-xpp50312/psana-xpp50312-r0082-pedestals.cfg

[psana]
files   = /reg/d/ana01/xpp/xpp50312/xtc/e178-r0082-s04-c00.xtc
modules = cspad_mod.CsPad2x2Pedestals

[cspad_mod.CsPad2x2Pedestals]
#source = DetInfo(:Cspad2x2)
source = DetInfo(XppGon.0:Cspad2x2.0)
output = cspad-pedestals-ave-xpp50312-r0082.dat
noise  = cspad-pedestals-rms-xpp50312-r0082.dat

Run psana with this configuration file:
qt. psana -c ana-xpp50312/psana-xpp50312-r0082-pedestals.cfg
In a few seconds this command produce two text files with one-dimensional (143560) array for CSPad2x2, which assumes physical shape (185,388,2).
Using, for example, a simple python script this files may be plotted

./PlotCSPad2x2ArrayFromFile.py cspad-pedestals-ave-xpp50312-r0082.dat 700 1400
./PlotCSPad2x2ArrayFromFile.py cspad-pedestals-rms-xpp50312-r0082.dat 0 20

Averaged pedestals:

RMS of pedestals: