Green dashed lines at eta=1.0,.1.06,2.0

red lines at eta=2.5, 4.0

 geom=2007

UPGR16, geom=2010

Speculative FGT++

another 6 disks are added at the following Z:

 Zstart  =   62.98  ! starting position along Z axis

 Z       = { 5.4, 15.4, 25.4, 35.4, 45.4, 55.4, 75., 90., 105., 120., 135., 150.}  ! Z positions of GEM front face

Green dashed lines at eta=1.0,.1.09,2.0

red lines at eta=2.5, 4.0