XenoGears Screen Resolution?

[IceManual]

Hey there artists, rippers, and generally great people of tSR.

I come to you today asking, does anyone have any idea what the correct/proper/default screen resolution is for the PS1 game XenoGears is? I've ripped a few face portraits via PSX-VRAM but I want to move onto sprites, in order to do this I need to know the correct screen res. So far as I've compared the ripped face set sizes to in game resolutions (I've tested I believe all that the PS1 could originally support) they don't match up any in game screen resolution sizes that ePSXe can provide.

Any help is appreciated.

Thank you.