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Two independent collimators, limiting the PDS detectors' FOV to $1.3$$^\prime$FWHM, can be rocked back and forth (max rocking angle of $3.5$$^\circ$, with five possible intermediate steps at 30$^\prime$, 60$^\prime$, 90$^\prime$and 150$^\prime$), thus making it possible to monitor source and background simultaneously.

Cristiano Guidorzi 2003-07-31