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      <Title>WFC3 IR Internal Flats</Title>
      
      <Abstract>This is a continuation of programs 11433 (SMOV), 11915 (Cy 17), 12338 (Cy 18), 12712 (Cy 19), 13098 (Cy 20), 13587 (Cy 21), 14029 (Cy 22), 14391 (Cy23), 14548 (Cy24), 14998 (Cy25), 15591 (Cy26), 15731 (Cy27), 16411 (Cy28), 16586 (Cy29), 17021 (Cy30), 17370 (Cy31), and 17691 (Cy32). We study the stability and structure of the IR channel flat field images through all filter elements.  Flats are monitored, to capture any temporal trends and delta flats are produced.  High signal observations will provide a map of the pixel-to-pixel flat field structure, as well as identify the positions of any dust particles.

This version contains a full set of IR filter exposures once in the middle of the cycle. In addition we will acquire 3 exposures in each of the broadband filters F105W, F110W, F125W, F140W, and F160W twice during the cycle.  This work builds on the ISR of Ryan &amp; Baggett (2015-011), Ryan (2019-06), and Green &amp; Shenoy (2024-10).



------ Calibration Justification -------

The target electrons per pixel is 40,000 - 60,000, so that the Poisson noise of an individual pixel and a single exposure will be 0.5%, comparable to or smaller than any individual astronomical image made by WFC3 IR.  With 2 well-exposed flats per medium- and narrow-band filter, the Poisson-limited noise after combining 2 individuals will be ~1.4x smaller.  For the broad-band filters, we can combine 3 exposures to produce bi-monthly flats, or combine a total of 18 exposures for a extremely low noise flats in the case temporal variations are limited.</Abstract>
      
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(Tic-Obset
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(Tic-Orbit
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            <TicDataCurrent>true</TicDataCurrent>
            
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            <VisitList>
               
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         <OnHoldComments />
         
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(Tic-Obset
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(Tic-Orbit
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            <TicNumOverruns>0</TicNumOverruns>
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         <SeqWithin>
            
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         <OnHoldComments />
         
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(Tic-Obset
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(Tic-Orbit
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            <TicDataCurrent>true</TicDataCurrent>
            
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            <TicNumOverruns>0</TicNumOverruns>
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         <SeqWithin>
            
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            <VisitList>
               
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         <Comments>Part of a mid cycle group of visits in all filters.</Comments>
         
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(Tic-Obset
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(Tic-Orbit
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            <TicDataCurrent>true</TicDataCurrent>
            
            <TicNumOrbits>1</TicNumOrbits>
            
            <TicNumOverruns>0</TicNumOverruns>
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            <SubExposures>
               
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         <SeqWithin>
            
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         <OnHoldComments />
         
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