# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0655699        0.00428989    
     0.460000          0.700000         0.0779647        0.00445557    
     0.700000           1.00000         0.0870175        0.00547828    
      1.00000           1.54000          0.100442        0.00537841    
      1.54000           2.40000          0.108236        0.00614833    
      2.40000           4.80000          0.106128        0.00854479    
      4.80000           10.0000         0.0978391         0.0141153