Comments on the Spectroscopic Data Reduction pages

[Robjharris37]

Hi All,

Thanks very much for writing the Spectroscopic Data Reduction pages. I've been working through the first one (https://learn.astropy.org/tutorials/1-SpectroscopicTraceTutorial.html) and noticed a few things.

• In section Step 2a, there is the line xvals = np.arange(image_data.width). Width - doesn’t exist anywhere else in the tutorial

• Step 4, the "to this" graph. In my head it would be nicer for the graph to be centred around 0

• It would be good to have a link to the second tutorial (wavelength solution) at the end of the first if that is possible.

Thanks once again for writing it. Now off to the second!