gEDA-user: Clearance in polygons

[Peter Baxendale]

Having tracked a board, I see that tracks generated using "signal" route
style have a clearance in polygons of 5 mil whilst those with "power"
style have 10 mil.

Where is this default clearance set? Under Route Style there's just a
clearance, set at 10 mil. Couldn't see any reference to polygon
clearance anywhere else. I know I can manually change them all with "k",
but I'd like a different default value for next time I do a board.