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I want to dither my exposures by exactly integral pixel amounts. What is the exact relationship between the POS TARGs we specify in the proposal and the CCD rows and columns?

April 26, 2017amounts dither exact exposures integral pixel pos relationship specify

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I want to dither my exposures by exactly integral pixel amounts. What is the exact relationship between the POS TARGs we specify in the proposal and the CCD rows and columns?

1 Answer

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The POS TARG axes run exactly along the CCD rows and columns on the specified aperture. For example, if you specify aperture WF3, the POS TARG axes will run *exactly* along the rows and columns on WF3.