HST Data Handbook for ACS

3.3 Keyword Usage

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CALACS processing will be controlled by the population of keywords and calibration switches in the input image headers. Those keywords essential for CALACS remain a subset of those used by CALSTIS, with keywords relating to spectroscopy and image binning being absent. Table 3.3 provides a summary of the keywords used by CALACS, specifying whether they function as input or output. For a definition of each keyword, refer to table 2.6.

Table 3.3: ACS Keywords used with CALACS

Keyword	Task(s)	I/O	Header	Sample of Possible Values
APERTURE	acsccd, acs2d, acssum	Input	Primary	WFC1,WFC2,WFC1-FIX, WFC2-FIX,WFC,HRC,SBC,...
ATODGNA, ATODGNB, ATODGNC, ATODGND	acsccd, acs2d, acsrej	Input/Output	Primary
BADINPDQ	acsrej	Output	Primary
BINAXIS1, BINAXIS2	calacs, acsccd, acs2d	Input	Primary
CCDAMP	acsccd, acs2d, acsrej	Input	Primary	ABCD, ABC, ABD, ACD, BCD, AC, AD, BC, BD
CCDCHIP	acsccd, acs2d, acsrej, acssum	Input	SCI,DQ,ERR	1,2
CCDGAIN	calacs, acsccd, acs2d	Input	Primary	1,2,4,8
CCDOFSTA, CCDOFSTB, CCDOFSTC, CCDOFSTD	acsccd, acs2d	Input	Primary
CRRADIUS	acsrej	Output	Primary
CRMASK	acsrej	Output	Primary
CRSIGMAS	acsrej	Output	Primary
CRTHRESH	acsrej	Output	Primary
DETECTOR	calacs, acsrej, acssum	Input	Primary	WFC,HRC,SBC
FILTER1, FILTER2	acsccd, acs2d, acssum	Input	Primary	CLEAR1L, F555W, F660N, F850LP, POL60UV
GLOBLIM	acs2d	Output	SCI	EXCEEDED,NOTAPPLICBLE, UNDETERMINED
GLOBRATE	acs2d	Input	SCI
INITGUES	acsrej	Output	Primary
LTM1_1, LTM2_2	acsccd, acs2d	Input/Output	SCI,ERR,DQ
LTV1, LTV2	acsccd, acs2d	Input/Output	SCI,ERR,DQ
NPIX1,NPIX2	calacs	Output	SCI
READNSEA, READNSEB, READNSEC, READNSED	acs2d, acsccd, acsrej	Input/Output	SCI
REJ_RATE	acsrej	Output	Primary
SCALENSE	acsrej	Output	Primary
SDQFLAGS	acs2d, acsccd, acssum	Input	Primary
STATFLAG	calacs	Input	Primary	T,F

 

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