[SBS_sim] Important Bug Fix on background sampling

[Evaristo Cisbani]

Dear All,

Bogdan found a bug in the digitization: the background signal is not
sampled correctly.

The error is in the transformation of time coordinate, I used for
sampling, that is:

 tT is the trigger time (that I assume 0)
 t0 is the first sampling (e.g. -100 ns)
 tH is the hit time (from -400 ns to 100 ns for background, around 0 for
signal)

The sampling time I used was: t=t0+tH, while the correct one is: t=t0-tH
This affects the background but not the signal (being tH ~ 0).

Unfortunately this may have impact on the results.

I fixed the bug and ran digitization again for g20 and g21. The new data
are posted in the usual directory (wrong data removed).

http://www.iss.infn.it/cisbani/atmp/gemc/production/

I apologize for the mistake!

Evaristo


-- 
 Evaristo Cisbani                      office : +39 06 4990 2847 
 Istituto Superiore di Sanita`         lab    : +39 06 4990 2347
 Department of Technology and Health   fax    : +39 06 4990 2137 
 and Istituto Nazionale di Fisica Nucleare Roma - gruppo Sanita`
 via Regina Elena 299 - 00161 Rome     web    : www.iss.infn.it/cisbani
 Italy
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