obsid   target                  start time      int time    inst    ccd     grat    drop rate(%)
-----------------------------------------------------------------------------------------------------------
16735	Cyg_X-1             	5:79111.045			24.1	ACIS-S	S4		HETG	16.1
16363	Crab                	31:15979.269		 9.6	ACIS-S	S1		NONE	8.0
16364	Crab                	111:73951.281		 9.3	ACIS-S	S1		NONE	6.4
16365	Crab                	227:81875.473		 9.6	ACIS-S	S1		NONE	3.3
18278	Abell_586           	351:37411.696		30.6	ACIS-I	I5		NONE	8.4