# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0215277        0.00215394    
     0.460000          0.700000         0.0205954        0.00221449    
     0.700000           1.00000         0.0249883        0.00251343    
      1.00000           1.54000         0.0304687        0.00287735    
      1.54000           2.40000         0.0324755        0.00362720    
      2.40000           4.80000         0.0324871        0.00441616    
      4.80000           10.0000         0.0304224        0.00682249