# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.120290        0.00278200    
     0.460000          0.700000          0.118277        0.00278969    
     0.700000           1.00000         0.0847880        0.00346028    
      1.00000           1.54000         0.0813660        0.00317008    
      1.54000           2.40000         0.0729865        0.00387122    
      2.40000           4.80000         0.0617153        0.00459396    
      4.80000           10.0000         0.0408444        0.00671961