XMM-Newton Data Files Handbook

4.1.6.3 RGS Auxiliary File

An RGS file (*R[1,2]*AUX.FIT) is created for each exposure in which at least one CCD node is producing either spectroscopy or high time resolution data. A single file per observation is created, where each row is labelled according to the relevant frame and CCD. Each file consists of two binary tables:

• the first binary table contains the frame/cycle details and statistics for all the active CCDs

• the second binary table contains the CCD read-out sequence description

The binary tables consist of the columns listed in Tabs. 14 and 15, respectively.

Table 14: RGS Auxiliary file (*R[1,2]*AUX.FIT) first binary table columns

Name	Type$^a$	Units	Description
FRAME	1J	COUNTER	Frame number
FTCOARSE	1I	SECOND	Coarse frame time$^b$
FTFINE	1I		Fine time frame$^b$
EOSCOARS	1J	SECOND	Coarse readout interrupt latched time$^b$
EOSFINE	1I		Fine readout interrupt latched time$^b$
FRMTIME	1I		Frame Integration Time
CCDID	1B		CCD identifier
SEQINDEX	1I	COUNTER	CCD-N index$^b$
NREJECTC	1J	PIXEL	No. of pixels exceeding rejection threshold (side C)$^b$
NACCEPTC	1J	PIXEL	No. of pixels below acceptance threshold (side C)$^b$
NUPPERC	1J	PIXEL	No. of pixels exceeding upper threshold (side C)$^b$
NREJECTD	1J	PIXEL	No. of pixels exceeding rejection threshold (side D)$^b$
NACCEPTD	1J	PIXEL	No. of pixels below acceptance threshold (side D)$^b$
NUPPERD	1J	PIXEL	No. of pixels exceeding upper threshold (side D)$^b$
NDPP	1J	PIXEL	Total number of pixels received by DPP frontend$^b$
NLOSTEVT	1I	COUNTS	Lost event counter
ABORTFLG	1I		Abort flag

$^a$See Sect. 9 for convention
$^b$set to 0 (zero) in High Time Resolution Mode

Table 15: RGS Auxiliary file (*R[1,2]*AUX.FIT) second binary table columns

Name	Type$^a$	Units	Description
SEQINDEX	1I	CONTER	Sequence index
CCDID	1B		CCD identifier
CCDNODES	1B		CCD Read-out node(s)
CCDOCB	1B		CCD OCB
CCDCSG	1B		CCD CSG
RTHRESHC	1I		CCD selection threshold (side C)
ATHRESHC	1I		CCD acceptance threshold (side C)
UTHRESHC	1I		CCD upper threshold (side C)
RTHRESHD	1I		CCD rejection threshold (side D)
ATHRESHD	1I		CCD acceptance threshold (side D)
UTHRESHD	1I		CCD upper threshold (side D)
WINDOWX0	1I	PIXEL	CCD X-start
WINDOWY0	I1	PIXEL	CCD Y-start
WINDOWDX	1H	PIXEL	CCD X-length
WINDOWDY	1H	PIXEL	CCD Y-length

$^a$See Sect. 9 for convention