Found it, here it is. Eagle format (5.x I think, it's been a while). Don't forget to run Ratsnest before printing it.
Its very simple. Cover it all, leave just the section 10 exposed. Turn on the UV light, and every time interval (I used 1 minute at the time, my UV source was not very strong) uncover another section.
When you develop the board, low numbers will be underexposed, high will be overexposed, and somewhere in between there will be your sweet spot
Turned out to be about 4 minutes for me at the time (UV lightbulb for dark light, not very ideal, too short wavelength). With my new UV LED based source it would be more like 10 second intervals.