The data acquisition code used is HIX
(Heterogeneous Information Exchange). In
this system, a front-end 486 PC is interfaced to a CAMAC crate via a HYTEC
controller. The PC reads out the data and sends it over the network to a
VAX server where the data are stored in a global section. A logger task
passes the data to the analyzer which enables the on-line analysis and also
write the data to disk and to tape. The data taking is controlled from the PC
under MS Windows. Only the events with at least two good X and two good Y
chambers are recorded on the tapes. A good chamber is defined as good reading
of its TDC's and ADC. The trigger rate is 
with
written to tapes. The filtered event rate is
with the CsI modules. During one week of data taking
raw events are collected per CsI crystal. The off-line
analysis is done by packing the data in PAW Ntples. ADC pedestals, drift
time-to-distance lookup tables and the calibration constants are determined
for each run.