Improvements to AIA+EUVI coordinates examples

[ayshih]

This PR fixes a number of issues I noted with coordinates examples that combine AIA and EUVI data (see #5529 (review))

Closes #5533

[nabobalis]

I leave it you to you if you want to changelog it.

[ayshih]

I won't bother with a changelog here because #5529 didn't either

[ayshih]

Incidentally, the position of the features in the AIA map don't exactly line up to the features on the EUVI map. There may be some issue with the metadata of one or both maps (observer location, plate scale, etc.).

[ayshih]

Incidentally, the position of the features in the AIA map don't exactly line up to the features on the EUVI map. There may be some issue with the metadata of one or both maps (observer location, plate scale, etc.).

It shouldn't block this PR, but here's a figure showing what I mean (the contours are from AIA transformed into the EUVI coordinate frame):

[ayshih]

The discrepancy is mostly due to the formation height of 304 A emission in the chromosphere, with the remaining discrepancy possibly due to inaccuracy in the reported pixel location of disk center in the EUVI metadata.

[nabobalis]

I am not sure if this is an issue but:

https://sunpy--5534.org.readthedocs.build/en/5534/_images/sphx_glr_AIA_limb_STEREO_002.png
lacks a title? At least it is missing the EUVI 304 title from master.

[ayshih]

Ah, whoops, forgot to check that. I pushed the title beyond the extent of the canvas, so I'll fix the figure size.

[Cadair]

I feel like this is a cool change and should at least have a changelog entry?

[ayshih]

I feel like this is a cool change and should at least have a changelog entry?

Okay, added

[Cadair]

Suggested change

	# Crop the view
	# Crop the view using pixel coordinates