file1 = '../fiber_scattering/20170209_212440/Beam_moments_by_element.dat'
file2 = '../fiber_scatter_yoffset/20170213_063559/Beam_moments_by_element.dat'
file3 = '../fiber_scatter_inf_off/20170213_200727/Beam_moments_by_element.dat'
plot file1 u 2:16 w l, file2 u 2:16 w l, file3 u 2:16 w l