Native 10:7 Aspect Ratio?

I'm curious what the deal is with the "Native" 10:7 aspect ratio option? Labelling it as native implies that it's the way the game is supposed to be viewed, but it's an aspect ratio I'm completely unfamiliar with. As far as I knew pretty much all PS2 games were mastered in 4:3. So what's up with this 10:7 option? From what I can see it's a slightly wider aspect ratio than 4:3 but doesn't necessarily look stretched or distorted like when you force 16:9. So, I was wondering if anyone can explain to me what's going on with 10:7, and if I should use it over 4:3 when trying to replicate an authentic PS2 presentation?