# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0446979        0.00296624    
     0.460000          0.700000         0.0479589        0.00287322    
     0.700000           1.00000         0.0515225        0.00297623    
      1.00000           1.54000         0.0444999        0.00354727    
      1.54000           2.40000         0.0455584        0.00399429    
      2.40000           4.80000         0.0339807        0.00476225    
      4.80000           10.0000         0.0320712        0.00697943