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HI 1A - Raw Image

HI 1A - Raw Image. HI 1A – Shutterless/Flatfield Corrected Image (secchi_prep). HI 1A – Bloom removed image. HI 1A – Background subtracted image. Starfield fitting for alignment. HI Calibration Parameters. HI Calibration Parameters. HI 1A – Star removal image. HI 2A – Milky Way.

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HI 1A - Raw Image

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  1. HI 1A - Raw Image

  2. HI 1A – Shutterless/Flatfield Corrected Image (secchi_prep)

  3. HI 1A – Bloom removed image

  4. HI 1A – Background subtracted image

  5. Starfield fitting for alignment

  6. HI Calibration Parameters

  7. HI Calibration Parameters

  8. HI 1A – Star removal image

  9. HI 2A – Milky Way

  10. HI 2A – Magellanic Clouds

  11. HI 1A – small-scale flatfield • Take series of images (at least 3) • Find the minimum value per pixel • Low-pass filter this background • Pixel-to-pixel variations are the difference between the two over small areas of the CCD • Do this many times to build up statistics for each pixel

  12. HI 1A – small-scale flatfield

  13. HI 1A – small-scale flatfield

  14. HI 1A – small-scale flatfield uncertainties

  15. HI 1A – large-scale flatfield • Identify stars in image • Wait for them to drift through the field of view • Measure the variation in their intensities as they do so. • Do this for many stars.

  16. HI 1A – large-scale flatfield

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