03) more details , answering Will

 This page provides more details addressing some of Will's questions.

 

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   2) fig 2: well, 500 chns is not a very "natural" unit, but I wonder
      what corresponds to 50 chns (e.g., the region of fluctuation
      250-300) ... I need to check my electronics readout diagrams
      again, or maybe folks more expert will comment

Fig 1.

Zoom-in of the god-to-bad region of BSMDE

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Fig 2. 

'Good' strips belong to barrel module 2, crate 2, sitting at ~1 o'cloCk on the WEST

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Fig 3. 

'BAD' strips belong also  to barrel module 2, crate 2, sitting at ~1 o'cloCk on the WEST