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Photometry - Coggle Diagram

- - - - 1.Count source
      - 2.Estimate background(annulus,Mode)
      - 3.Substruct Background
  - - - total count$$ S+B$$
    - - background $$B$$
      - dark current$$ N_d$$
      - read noise (rms)$$ N_r={\sigma_r}^2$$
      - estimated background $$\sigma_B$$
      - # of pixels$$n_s$$