Roof Paint, where does it start/stop?

[k5kev]

I'm in the process of having my Burb painted, and am going with white on the roof and blue everywhere else. My question is where should the white start/stop. How did it come from the factory on a two tone? Should the white wrap all the way around the drip rail, or should the blue come up the vertical face of the drip rail?

I looked at a lot of pics here but they can be hard to see, and not to mention there are a lot of non-stock paint jobs.

Thanks for the help guys.