First argument:
AllRats | Create rat lines for all loaded nets that aren't already connected on with copper. |
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SelectedRats | Similarly, but only add rat lines for nets connected to selected pins and pads. |
Close | Selects the shortest unselected rat on the board. |
The second argument is temporary and optional, for a workaround of a bug in the old (to be removed) autorouter. If the value of the second argument is "manhattan", non-axis-aligned lines are ignored when looking for rat anchor points.