obsid   target                  start time      int time    inst    ccd     grat    drop rate(%)
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4690	NGC_45              	16:17787.603		35.3	ACIS-S	I6		NONE	31.4
6122	HD_179949           	151:23025.340		32.7	ACIS-S	I6		NONE	4.4
5760	cl0216-1747         	250:51535.374		42.0	ACIS-I	I5		NONE	3.2