10.5.4 ACS WFC Allowed Combinations of Aperture, Spectral Element, and Readout

Only a subset of possible combinations of aperture, spectral element, and readout pattern are permitted with the ACS/WFC, and this articles shows these combinations.

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Format definitions

Boldface type indicates the name of an APT parameter or a value for a parameter.

(red star) Black text indicates an important note.

Magenta text indicates available but unsupported parameters (requires prior approval from STScI).

Red text indicates restricted parameters (for STScI use only).

Brown text indicates text file parameters.

Items in brackets - <value> - are required values.

Items in square brackets - [<value>] - are optional.

Table 10.6: Allowed Aperture, Spectral Element & Readout Combinations

ApertureAllowed Spectral Elements1Readout

WFC

F S

full frame2

WFC-FIX

F F

full frame 

WFC1  FSfull frame23
WFC1-FIXFfull frame3
WFC2Sfull frame2,3
WFC2-FIXFfull frame3

WFCENTER

F

full frame

WFC1-CTE

Ffull frame3
WFC1-CTEFfull frame3

WFC1-512

F

subarray fixed by STScI

WFC1-1K

F

subarray fixed by STScI

WFC1-2K

F

subarray fixed by STScI

WFC2-2K

F

subarray fixed by STScI

WFC1-IRAMP F Ifull frame3
WFC1-MRAMPF M Sfull frame3
WFC2-MRAMPF M Sfull frame3
WFC2-ORAMPF Ofull frame3

WFC1-IRAMPQ

F I

subarray fixed by STScI

WFC1-MRAMPQ

F M S

subarray fixed by STScI

WFC2-MRAMPQ

F M S

subarray fixed by STScI

WFC2-ORAMPQ

F O

subarray fixed by STScI

WFC1A-512

F

subarray fixed by STScI

WFC1B-512

F

subarray fixed by STScI

WFC2C-512

F

subarray fixed by STScI

WFC2D-512

F

subarray fixed by STScI

WFC1A-1K

F

subarray fixed by STScI

WFC1B-1K

F

subarray fixed by STScI

WFC2C-1KFsubarray fixed by STScI
WFC2D-1KFsubarray fixed by STScI
WFC1A-2KFsubarray fixed by STScI
WFC1B-2KFsubarray fixed by STScI
WFC2C-2KFsubarray fixed by STScI
WFC2D-2KFsubarray fixed by STScI

1F = normal WFC filters and G800L,
S = small elements (polarizers and F892N),
I = inner ramp filter segments,
M = middle ramp filter segments,
O = outer ramp filter segments

2 A subarray fixed by STScI will apply to WFC, WFC1, WFC2 when a small spectral element (polarizer of F892N) is selected.

3 A user specified subarray may be requested via Optional Parameters SIZEAXIS1 and/or SIZEAXIS2.

Related Links

10.5.1 ACS WFC Spectral Elements
10.5.2 ACS WFC Permitted Filter Combinations
10.5.3 ACS WFC Ramp Filter Ranges
10.5.5 ACS SBC Spectral Elements
10.5.6 ACS Aperture Coordinate System




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