# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.146967        0.00554614    
     0.460000          0.700000          0.156430        0.00499336    
     0.700000           1.00000          0.198404        0.00668651    
      1.00000           1.54000          0.356089         0.0130912    
      1.54000           2.40000          0.412878         0.0197816    
      2.40000           4.80000          0.382818         0.0354649    
      4.80000           10.0000          0.309651         0.0790154