# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.114946        0.00434211    
     0.460000          0.700000          0.114194        0.00395903    
     0.700000           1.00000         0.0889359        0.00459833    
      1.00000           1.54000         0.0866726        0.00405213    
      1.54000           2.40000         0.0790755        0.00551231    
      2.40000           4.80000         0.0822725        0.00657441    
      4.80000           10.0000         0.0533968        0.00897065