light blue edge lines..

[wsimike]

Hello all..

Quick question here..

I'm modeling a natural-looking cliff wall in AC3D (just registered it recently.. great program!)..

For some reason, there's a single row of edges that are this light blue color. I don't know why they're like that and I can't seem to figure out how to get rid of them... I'm guessing they're a flaw due to something I did wrong while modeling.

If anyone knows what I'm referring to and can explain what they mean and how to fix them, that would be very appreciated! Thanks!