# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0383984         0.0119884    
     0.700000           1.00000         0.0405113         0.0115277    
      1.00000           1.54000         0.0944428        0.00521100    
      1.54000           2.40000         0.0978705        0.00259431    
      2.40000           4.80000         0.0922889        0.00176978    
      4.80000           10.0000         0.0883228        0.00192261