# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.402091        0.00407307    
     0.460000          0.700000          0.420796        0.00452427    
     0.700000           1.00000          0.457966        0.00637285    
      1.00000           1.54000          0.436735        0.00640429    
      1.54000           2.40000          0.378956        0.00760074    
      2.40000           4.80000          0.262460        0.00755178    
      4.80000           10.0000          0.192922        0.00937780