obsid   target                  start time      int time    inst    ccd     grat    drop rate(%)
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28653	NGC_4579            	151:74855.325		30.0	ACIS-S	S6		HETG	5.0
30114	GW170817            	152:20200.484		 1.0	ACIS-S	I4		NONE	35.2
30162	NGC3626             	315:39063.209		 0.5	ACIS-S	I4		NONE	39.3