# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.183395        0.00179731    
     0.460000          0.700000          0.179400        0.00171479    
     0.700000           1.00000          0.178715        0.00214790    
      1.00000           1.54000          0.167892        0.00236999    
      1.54000           2.40000          0.150479        0.00310794    
      2.40000           4.80000          0.127669        0.00424578    
      4.80000           10.0000         0.0903409        0.00707402