line offset:	1873.8369	3761.9386	-780.0321	1205.8064
line slope:	 795.0781	1580.9992	1098.4752	1648.9750
slope ratio:	   0.5029	   0.6662
subtract ped line offset:	-11161.9570	-6611.6119	-27775.8310	-19857.0763
subtract ped line slope:	 796.1727	1582.0830	1075.7157	1649.6890
slope ratio:	   0.5032	   0.6662
offset:	-11080.5624	-6531.0208	-29468.2669	-19803.9799
x a,b,c:	   0.3137	  -1.1336	   0.0437
y a,b,c:	  -0.0495	   1.1946	   0.0591
fval:	   0.2290	   0.1205
x err:	   0.2676	   0.1523	   0.2200
y err:	   0.2604	   0.1939	   0.1738