# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000        0.00700517        0.00408387    
      1.00000           1.54000         0.0100947        0.00780899    
      1.54000           2.40000         0.0148300        0.00856816    
      2.40000           4.80000         0.0114035         0.0122478    
      4.80000           10.0000         0.0180262         0.0158320