Spring cup offset

[Novamartin16v]

Hi
Maybe silly question but where are spring cup offset measured from?
Basically, by looking at the cups, which is which?
Thanks

[K-Brewer]

http://i1078.photobucket.com/albums/w500/Brewskie24/Mobile%20Uploads/Screenshot_20171209-215357.png (http://s1078.photobucket.com/user/Brewskie24/media/Mobile%20Uploads/Screenshot_20171209-215357.png.html)

[Novamartin16v]

Thanks