I believe I found an error in the mback function where I get a NameError saying the name ‘f1_chantler’ is not defined. I found that simply adding f1_chantler to the larch_plugins.xray import section in mback.py fixes the problem. I have included the modified mback.py code, my input data (SigScan226827.txt), project code (mback_test.py), and the error I received (mback_error.txt).

I am running python 2.7 with anaconda as my manager, macOS Sierra v10.12, on a mid-2015 15” MacBook pro. I hope this report is correct and helpful.