# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.215341        0.00213986    
     0.460000          0.700000          0.232892        0.00173913    
     0.700000           1.00000          0.250001        0.00208229    
      1.00000           1.54000          0.285716        0.00241770    
      1.54000           2.40000          0.300532        0.00384666    
      2.40000           4.80000          0.299047        0.00629350    
      4.80000           10.0000          0.281740        0.00979182