obsid   target                  start time      int time    inst    ccd     grat    drop rate(%)
-----------------------------------------------------------------------------------------------------------
16360	Crab                	18:50654.628		 9.6	ACIS-S	S1		NONE	16.9
16361	Crab                	100:53886.962		 9.6	ACIS-S	S1		NONE	13.6
17064	UGC_1859            	173:38303.973		10.1	ACIS-S	S4		NONE	15.9
16362	Crab                	228:06552.894		 9.6	ACIS-S	S1		NONE	14.4
16259	Crab                	310:27082.257		 9.7	ACIS-S	S1		NONE	9.5