including files 
XIS1_from20050727_1938to20050727_2344.evlist.gz
XIS1_from20050728_0002to20050729_0000.evlist.gz
XIS1_from20050729_0000to20050730_0000.evlist.gz
XIS1_from20050730_0000to20050730_1655.evlist.gz
There are 0 pixels with more than 179 events in 17904 frames in the cal source region.