# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0268364         0.0103551    
     0.460000          0.700000         0.0165014         0.0112223    
     0.700000           1.54000         0.0264165        0.00550307    
      1.54000           2.40000         0.0306803        0.00504651    
      2.40000           4.80000         0.0252751        0.00369235    
      4.80000           10.0000         0.0194685        0.00490261