# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0423354        0.00707509    
     0.460000          0.700000         0.0434709        0.00739436    
     0.700000           1.00000         0.0328031         0.0111094    
      1.00000           1.54000         0.0323180         0.0125029    
      1.54000           2.40000         0.0414816         0.0186287    
      2.40000           10.0000         0.0390766         0.0247148