General description of the Si detector is given in subsection 3.6.
For the cross-talk discussion, it is important to remember the
channel numbering scheme of the detector: channel
``1'' is in the outer ring, then the numbering proceeds sector by sector,
so that you can trace it with a continuous curve, going azimuthally
counter-clockwise, looking along the beam direction.
Every sector (16 channels) is read out by the same AMPLEX chip,
one sector per chip.