# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00553031         0.0128944    
     0.460000          0.700000         0.0144460        0.00440486    
     0.700000           1.00000        0.00895823        0.00509738    
      1.00000           1.54000         0.0131244        0.00336337    
      1.54000           2.40000         0.0155470        0.00480954    
      2.40000           4.80000        0.00933855        0.00645449    
      4.80000           10.0000         0.0207861        0.00656680