...
Each layer is composed of double-sided sensor modules to measure coordinates in two views. The table below shows the radial extant extent of the disks and the inner |z| position for the "A" and "B" sensor planes.
...
There are also three forward disks composed of double-sided sensor modules to measure coordinates in two views. The table below shows the radial extant extent of the disks and the inner |z| position for the "A" and "B" sensor planes.
...