# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.403504        0.00566623    
     0.460000          0.700000          0.406761        0.00511656    
     0.700000           1.00000          0.434373        0.00633585    
      1.00000           1.54000          0.504278         0.0103021    
      1.54000           2.40000          0.526282         0.0149186    
      2.40000           4.80000          0.451834         0.0222765    
      4.80000           10.0000          0.243069         0.0416072