# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0119227        0.00476033    
     0.460000           1.00000        0.00589311        0.00343308    
      1.00000           1.54000        0.00620788        0.00543714    
      1.54000           2.40000        0.00551784        0.00753636    
      2.40000           4.80000         0.0169776        0.00538898    
      4.80000           10.0000         0.0108809         0.0101188