obsid   target                  start time      int time    inst    ccd     grat    drop rate(%)
-----------------------------------------------------------------------------------------------------------
517		VIRGO_CLUSTER       	106:28294.684		 9.9	ACIS-I	I6		NONE	16.3
659		SS_433_(EAST_JE     	179:14020.339		10.0	ACIS-S	S6		NONE	58.5
669		1746.7-3224         	243:73443.520		 6.9	ACIS-S	I6		NONE	9.9
938		AX_J1227+4421       	278:19544.812		 6.1	ACIS-I	I6		NONE	6.7