Dear Dr. Newville,I have tried to use the flu_corr() function to correct some of my recent x-ray data on the cobalt K-edge.Unfortunately, after multiple tryout I am unable to get it to work properly.I have received this error message a couple of time.File "/Volumes/Python/anaconda/lib/python2.7/site-packages/larch/__init__.py", line 37, in wrapperreturn fcn(*args, **keywords)File "/Volumes/Python/anaconda/share/larch/plugins/xafs/fluo.py", line 57, in fluo_corrmuvals = material_mu(formula, energies, density=1, _larch=_larch)File "/Volumes/Python/anaconda/lib/python2.7/site-packages/larch/__init__.py", line 37, in wrapperreturn fcn(*args, **keywords)File "/Volumes/Python/anaconda/share/larch/plugins/xray/materials.py", line 68, in material_mumater = _materials.get(name.lower(), None)file <stdin>, line 0AttributeError: ‘int' object has no attribute 'lower'I have a .dat file two column with energy and normalized mu (I have done most of the energy corrections during my shift at the synchrotron).I am able to load both energy and mu, yet I am not sure I handle the different args correctly in the fluo_corr() function.Here is how I tried:fluo_corr(dat.energy, dat.mu, formula=None, elem=‘Co’, edge=‘K’)Thanks in advance for your help,Best,Gerome