/Users/SeanFackler/anaconda/bin/python /Users/SeanFackler/PycharmProjects/msp_sean/mback_test.py

Traceback (most recent call last):
  File "/Users/SeanFackler/PycharmProjects/msp_sean/mback_test.py", line 53, in <module>
    _larch=mylarch)
  File "/Users/SeanFackler/anaconda/share/larch/plugins/xafs/mback.py", line 122, in mback
    f1 = f1_chantler(z, energy, _larch=_larch)
NameError: global name 'f1_chantler' is not defined

Process finished with exit code 1