including files 
XIS1_from20070419_1012to20070420_0000.evlist.gz
XIS1_from20070420_0000to20070421_0000.evlist.gz
XIS1_from20070421_0000to20070421_0618.evlist.gz
There are 10 pixels with more than 727 events in 16464 frames in the cal source region.
          51         812       13132
         214         863        4475
         222         882        2879
         135         902        2039
         179         950        5642
          42         952       10847
         249         967        2760
         164         973       11984
         227         977       10456
         123         985        2459