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Hello All, I've taken the straight tracks from the field-off run 5784 and projected them to the Ecal. The residuals are plotted in the attachment using the z position of the cluster (which was essentially constant at 1393.7). Although the accuracy is quite good (~2.5 to ~3 mm) there are clear systematic shifts in both x and y for both top and bottom. Do these patterns make sense to anyone? I've also attached the cluster x-y positions, showing the fiducial cuts imposed on the clusters. I should note that these events were reconstructed using a non-production steering file. The calorimeter positions were taken from the uncorrected cluster collections pointed to by the ReconstructedParticle objects. The reconstruction did use the HPS-EngRun2015-Nominal-v2 detector which has the SVT survey incorporated. Have the ECal survey numbers been incorporated into this detector? If not, are these shifts commensurate with any of the measured offsets? Thanks, Norman ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1