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A 2D-ROI, summed over pixels.  Mean value of pixel-sum is plotted vs. step_value.  The "-b" and "-f" flags slow down the data so it doesn't go by too quickly (there are unfortunately some race conditions in ami between the start of the analysis graph and the reading of the data).

ami-local -b 1001 -f interval=0.0023 -l /reg/grix_width_scan.fc psana://exp=rixx43518,run=45,dir=/cds/data/psdm/tutorialsprj/ami2/neh2.2/epixroi_meanvscan.fcpublic01/xtc psana://exp=rixx45619,run=122,dir=/cds/data/psdm/prj/public01/xtc/

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