line offset:	21506.2220	21788.4530	53906.0440	19558.8301
line slope:	 513.5888	 520.3287	1287.3270	 467.0833
slope ratio:	   0.9870	   2.7561
subtract ped line offset:	15020.3095	16636.4286	39594.8802	9049.0510
subtract ped line slope:	 358.6991	 397.2936	 945.5630	 216.0998
slope ratio:	   0.9029	   2.7561
offset:	8534.3970	11484.4041	25283.7164	-1460.7282
x a,b,c:	  -2.3513	  -0.7646	   0.0752
y a,b,c:	   0.3137	   0.8849	   0.0472
fval:	   0.7097	   0.3598
x err:	   0.2008	   0.1255	   0.1567
y err:	   0.1933	   0.1576	   0.1118