# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0387200        0.00207188    
     0.460000          0.700000         0.0485377        0.00197243    
     0.700000           1.00000         0.0592954        0.00236453    
      1.00000           1.54000         0.0699962        0.00231126    
      1.54000           2.40000         0.0753193        0.00340965    
      2.40000           4.80000         0.0702740        0.00448063    
      4.80000           10.0000         0.0578200        0.00877167