# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000         0.0675102         0.0401613    
      1.00000           1.54000          0.301967         0.0593065    
      1.54000           2.40000          0.447949         0.0259973    
      2.40000           4.80000          0.304194         0.0133795    
      4.80000           10.0000          0.205109         0.0126618