First tutorial in specutils series

[eblur]

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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[kelle]

What's the motivation for calling it xid. Is there a more descriptive variable name we could use?

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[eblur]

How about crossmatch_id ?

[jeffjennings]

Hi @eblur and @kelle, I realize this PR is from a few years ago, but it looks like the tutorial is complete and the review is effectively resolved. If the tutorial is still something you'd like to merge, I think it would just need to be updated with more recent versions of the dependencies (I tried simply to run the notebook with recent versions and it failed). Is this something you'd like to come back to, in order to update it slightly and have it merged? Thanks!

[kelle]

Hmm, I think the plotting bit has changed. Can we get a review from @bmorris3 ?

(Also, @bmorris3 , you are my GO TO person for all things specutils. If there are other people to loop in, please let me know and/or delegate/nominate. )