User name R. Michaels
Log entry time 14:41:52 on December 19,1999
Entry number 31521
keyword=meaning of (-1,-1) in T2
This refers to halog 31502, 31504.
The seemingly impossible (-1,-1) combination
for T2 is due to far-off-time hits. A "hit" is defined
as a signal in TDC (hence above threshold) between
channel 500 and 3500 (0.1 nsec per chan). The -1
are often hits which the TDC reads as 4096, i.e.
end of the range. I did verify this some time ago for
the (-1,-1) T2's. Not sure what causes this, but they
are very rare in the S-Ray triggers (T1,T3).