# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0706651         0.0226149    
     0.460000           1.00000         0.0217860         0.0118205    
      1.00000           1.54000         0.0652047        0.00938699    
      1.54000           2.40000         0.0709326        0.00485441    
      2.40000           4.80000         0.0747140        0.00351383    
      4.80000           10.0000         0.0752636        0.00396567