obsid   target                  start time      int time    inst    ccd     grat    drop rate(%)
-----------------------------------------------------------------------------------------------------------
14679	Crab                	12:66299.155		 4.6	ACIS-S	S1		NONE	24.1
14680	Crab                	56:05570.258		 4.6	ACIS-S	S1		NONE	23.9
14685	Crab                	66:16685.761		 9.6	ACIS-S	S1		NONE	25.0
14681	Crab                	113:77078.357		 4.6	ACIS-S	S1		NONE	23.4
14682	Crab                	228:82483.360		 4.6	ACIS-S	S1		NONE	21.9
14678	Crab                	281:18079.579		 4.6	ACIS-S	S1		NONE	21.1
16245	Crab                	292:78943.114		 9.6	ACIS-S	S1		NONE	22.4
16257	Crab                	308:72816.069		 9.6	ACIS-S	S1		NONE	22.0