# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.130416        0.00389009    
     0.460000          0.700000          0.136006        0.00351829    
     0.700000           1.00000          0.153988        0.00400117    
      1.00000           1.54000          0.131329        0.00304136    
      1.54000           2.40000          0.102410        0.00319837    
      2.40000           4.80000         0.0749666        0.00337931    
      4.80000           10.0000         0.0514084        0.00446088