# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.189842        0.00412969    
     0.460000          0.700000          0.185792        0.00408142    
     0.700000           1.00000          0.212470        0.00522383    
      1.00000           1.54000          0.188202        0.00566307    
      1.54000           2.40000          0.150886        0.00738510    
      2.40000           4.80000          0.125949        0.00963725    
      4.80000           10.0000          0.121112         0.0144774