Planarity of the membrane (cont.)

 Hejdar did the calculation for accounting delays on membrane of light from defusers. 
See
https://drupal.star.bnl.gov/STAR/system/files/membrane.pdf
just add more accurate accounting shadow due to Inner Field Cage.

Taking into account light delays for diferent rafts and defusers from 

/*

  A.Lebedev 02/11/08
  Delays for laser rafts.
  T-zero is a moment, when a laser arrived to TPC wheel surface. 
  All other numbers corresponded to time for laser light to propagate to particular raft (TPC sector). 
  Estimated error in table   0.1ns
  West:     sector             2             4         6        8             12
  Time(ns)                 10.33          3.34      6.14    13.11          17.31
  East:     sector            14            16        18       20      22     24
  Time(ns)                 19.88         12.95      5.97     3.18   10.17  17.14
  For diffusers West <=> East
*/