Index: thermal.c
===================================================================
--- thermal.c	(revision 12412)
+++ thermal.c	(revision 12413)
@@ -145,7 +145,7 @@
 				}
 				else {
 					atmp.StartAngle = ea;
-					atmp.Delta = 100;
+					atmp.Delta = 360-ea+sa;
 				}
 				atmp.Width = atmp.Height = clrth;
 				pb = pcb_poly_from_arc(&atmp, clr);