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Tutorials for the Astropy Project

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- [x] Check the box to confirm that you are familiar with the [contributing guidelines](https://learn.astropy.org/contributing/how-to-contribute) and/or indicate (check the box) that you are familiar with our contributing workflow. - [x]...

- [x] Check the box to confirm that you are familiar with the [contributing guidelines](https://learn.astropy.org/contributing/how-to-contribute) and/or indicate (check the box) that you are familiar with our contributing workflow. - [x]...

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- [x] Check the box to confirm that you are familiar with the [contributing guidelines](https://learn.astropy.org/contributing/how-to-contribute) and/or indicate (check the box) that you are familiar with our contributing workflow. - [x]...

- [x] Check the box to confirm that you are familiar with the [contributing guidelines](https://learn.astropy.org/contributing/how-to-contribute) and/or indicate (check the box) that you are familiar with our contributing workflow. - [x]...

Part 1 of a specutils tutorial series **How to Load, Plot, and Smooth an Optical Spectrum from SDSS** Ready for review. This is in response to Issue #440

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- [x] Check the box to confirm that you are familiar with the [contributing guidelines](https://learn.astropy.org/contributing/how-to-contribute) and/or indicate (check the box) that you are familiar with our contributing workflow. - [x]...

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- [ x] Check the box to confirm that you are familiar with the [contributing guidelines](https://learn.astropy.org/contributing/how-to-contribute) and/or indicate (check the box) that you are familiar with our contributing workflow. -...

I believe that I have have found a mathematical error in the User-Defined-Model tutorial (Full custom model section). The derivatives should be d_a = np.sin(b\*x+c) and d_c = a\*np.cos(b\*x+c)

Review the content and provide updates that are relevant for an undergraduate audience. * [Astronomical Coordinates 1](https://learn.astropy.org/tutorials/1-Coordinates-Intro.html) - SS (primary), CZ, LL * [Astronomical Coordinates 2](https://learn.astropy.org/tutorials/2-Coordinates-Transforms.html) - CZ (primary), LL...

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Review the content and provide updates that are relevant for an undergraduate audience. * [Viewing and manipulating data from FITS tables](https://learn.astropy.org/tutorials/FITS-tables.html) * [Viewing and manipulating FITS images](https://learn.astropy.org/tutorials/FITS-images.html) * [Edit a...

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