Hi Jeff,
I'm been trying different patterns from sandify.
The web pattern resulted in a .thr with a rho=1.00001 - see below
And the python math acos(float(rho)) threw an "math" error.
I included a if (float(rho)>1.0): rho="1.0" line to workaround it.
Thanks,
–Antonio
-61.26003 0.99970
-61.28412 1.00000
-61.28955 1.00001
-61.30130 0.97787
-61.31360 0.95588
-61.31371 0.95569