# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.206776        0.00458597    
     0.460000          0.700000          0.227341        0.00444280    
     0.700000           1.00000          0.243967        0.00457477    
      1.00000           1.54000          0.296169        0.00550973    
      1.54000           2.40000          0.298676        0.00673717    
      2.40000           4.80000          0.302679        0.00975378    
      4.80000           10.0000          0.275799         0.0153510