obsid   target                  start time      int time        inst    ccd     grat    drop rate(%)
----------------------------------------------------------------------------------------------------
532	A697                	294:11776.667	9.2		ACIS-I	I5	NONE	11.7
1440	CAS_A,_CHIP_S3,     	324:81162.207	1.0		ACIS-S	S6	NONE	11.0
1436	CAS_A,_CHIP_S1,     	324:69947.566	2.9		ACIS-S	S6	NONE	10.4
1438	CAS_A,_CHIP_S4,     	324:73247.270	2.9		ACIS-S	S6	NONE	3.2
1447	CAS_A,_CHIP_I3,     	325:08759.560	5.0		ACIS-I	I6	NONE	4.4
1446	CAS_A,_CHIP_I2,     	325:04647.583	2.4		ACIS-I	I6	NONE	3.7
1445	CAS_A,_CHIP_I1,     	325:01847.567	2.4		ACIS-I	I6	NONE	3.4