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CALs distances IMPORTANT NOTE:1) Consider that each CsI crystals has a wrapper around 0.75mm thick. This wrapper thickness must be subtracted to have the exact distances.  Hext (CsI layer height)=21.34mm  Hint (CsI crystal height)=19.9mm   DH=Hext - Hint=1.44mm --> wrapper thickness=0.72mm 272mm  2) At each crystal end there are both gap and endcap. The gap+endcap length is around 6mm  (the length is variable reffering to NLR drawings, link below)   Lext (CsI layer length)=338mm   Lint (CsI crystal length)=226mm   DL=Lext - Lint=12mm --> gap+endcap length=6mm 6mm