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Date: Sat, 21 Jun 2014 12:27:00 -0400
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From: DJ Delorie <dj AT delorie DOT com>
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	(message from Peter Clifton on Sat, 21 Jun 2014 13:30:34 +0100)
Subject: Re: [geda-user] pcb: Patch for arcs with different radii for x and
 y on screen
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> I "think" if gerber supports them, then getting arbitrary axis
> directions will still be awkward / impossible without approximation.

Gerber doesn't support them.  At least, not reliably across fabs.  We
approximate them with line segments.