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Re: gEDA-user: Setup Groups in PCB for 4-layers

> I'm not clear on the groups in the PCB preferences.  If I want to
> auto route a board in 4 layers how do I set up the groups?

Groups are your physical layers on the board.  You should order them
from top to bottom (or bottom to top, I suppose) and mark the
top/bottom special layers.

Drawing layers are what the autorouter uses.  You should hide any
layer you don't want the autorouter to use, leaving the shown ones for
it.  Then optimize your rats and start the autorouter.

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