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Just one small footnote - the ribbon geometry is slightly different since the ribbons follow the tiles; see schematics at http://www.slac.stanford.edu/exp/glast/ground/LATSoft/geometry/pictures/ACD/newSides/XRibbonAnnot.png^{Image Removed} (older geometry)
and http://www.slac.stanford.edu/exp/glast/ground/LATSoft/geometry/pictures/ACD/newerSides/v1r45p2-Xmeas-print.png^{Image Removed}

I asked about the y offset between the square and trapezoid and Joanne responds that the new positions should be more accurate. These come from the CAD model, while the older positions were based on approximations.

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