# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0123043        0.00205323    
     0.460000          0.700000         0.0255178        0.00193954    
     0.700000           1.00000         0.0323969        0.00220099    
      1.00000           1.54000         0.0426818        0.00247508    
      1.54000           2.40000         0.0357204        0.00311262    
      2.40000           4.80000         0.0431613        0.00385706    
      4.80000           10.0000         0.0428729        0.00545605