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SP-2566: a new NB tutorial on extendedness parameters#138

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SP-2566: a new NB tutorial on extendedness parameters#138
galaxyumi wants to merge 2 commits intomainfrom
tickets/SP-2566

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This new NB tutorial demonstrates the DP1 flux-based and size-based extendedness parameters.

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@christinawilliams christinawilliams Apr 15, 2026

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I think CModel should be cModel? Please check.

Also in the same bullet point, PSF is already defined and the acronym can be used at the end.


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@christinawilliams christinawilliams Apr 15, 2026

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Probably good to also list and define the returns fig, axes in the header.


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@christinawilliams christinawilliams Apr 15, 2026

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Again maybe CModel -> cModel in the 2nd bullet point, and also in the ratio in the 2nd to last sentence. Maybe cModel and psfFlux should be in quotes?

Might be useful to explicitly spell out the parameter name i.e. <f>_free_cModelFlux and <f>_free_psfFlux in the bulletpoints (here at first definition).

I also wonder if it is worth a sentence to explain what the significance of the number 0.985 is and why that is the threshold for choosing which of the two flags the extendedness parameter gets.


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@christinawilliams christinawilliams Apr 15, 2026

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cModel should be in quotes?


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@christinawilliams christinawilliams Apr 15, 2026

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Might be good to briefly say what free means in this case and why it is used instead of the non free versions of the flux measurements (because i think in the photometry notebook we don't use the free version of cModel and instead recommend the fixed one)


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@christinawilliams christinawilliams Apr 15, 2026

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Maybe state the exact name of the parameter in quotes after "This parameter"


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@christinawilliams christinawilliams Apr 15, 2026

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Need a period after the intro sentence in Section 5


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@christinawilliams christinawilliams Apr 15, 2026

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Again maybe CModel should be cModel. Also suggest clarifying what "not populated" means (is it NaN? Replaced by -99 or -1 or just blank? Could help people include a way to exclude them)


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I reviewed the notebook and left some comments in reviewNB. Please let me know if you have questions or what you think. Otherwise I think it is ready to post!

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Great notebook Yumi! I left a number of comments but they are minor, I hit approve so that once the feedback is included you can merge.

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