# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.168107        0.00136954    
     0.460000          0.700000          0.170343        0.00131812    
     0.700000           1.00000          0.171352        0.00160626    
      1.00000           1.54000          0.170387        0.00186305    
      1.54000           2.40000          0.165560        0.00271984    
      2.40000           4.80000          0.151823        0.00369130    
      4.80000           10.0000          0.144957        0.00548741