# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.198415        0.00366427    
     0.460000          0.700000          0.213905        0.00369957    
     0.700000           1.00000          0.228934        0.00501471    
      1.00000           1.54000          0.254602        0.00583012    
      1.54000           2.40000          0.260881         0.0104328    
      2.40000           4.80000          0.274634         0.0155128    
      4.80000           10.0000          0.271317         0.0326327