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A "step scan" is a mode where the DAQ is paused whenever the scan variable changes.  Unlike a fly-scan, it is possible to assigned each event to a well-defined scan variable value.  These scans are typically controlled by the hutch-python tool, which uses the bluesky tool from BNL.  In this particular example, pedestal subtraction helps the fit significantly and is done in a kludgy way with using /reg/g/psdm/tutorials/ami2/neh2.2/manta_ped.py which generates a numpy pedestal file /reg/g/psdm/tutorials/ami2/neh2.2/manta_ped.npy.  The pedestal subtraction is done with a PythonEditor box.

ami-local -b 1 -f interval=0.13 -l /reg/g/psdm/tutorials/ami2/neh2.2/rix_width_scan.fc psana://exp=rixx43518,run=45,dir=/cds/data/psdm/prj/public01/xtc

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