Thanks for that info! I saw
this post as well which backs up what you are saying:
However this slightly conflicts with my own measurement of in-game circles which appear symmetrical when width = 720, and ever so slightly squished when width = 704.
As I have no capture card, here is a Photoshop simulation of what I'm observing.
Nintendont width = 720; circle measures symmetrical with ruler on screen
Nintendont width = 704; circle measures slightly unsymmetrical
Photoshop: image width reduced to 98% (704/720)
Nintendont width = Auto / 640; obvious aspect problem
Photoshop: image width reduced to 89% (640/720)
However, since I tend to believe the claim about 10:11 pixel ratio, I lean towards 704 being the correct width, with the assumption that the artistic intent of the HUD is that the circle is ever so slightly squished.