# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.137892        0.00535117    
     0.460000          0.700000          0.164157        0.00484993    
     0.700000           1.00000          0.226429        0.00641991    
      1.00000           1.54000          0.337256         0.0105250    
      1.54000           2.40000          0.413447         0.0169154    
      2.40000           4.80000          0.394263         0.0271820    
      4.80000           10.0000          0.534024         0.0614493