# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0644918         0.0590743    
     0.460000           1.54000         0.0475859         0.0123624    
      1.54000           2.40000         0.0182534        0.00841232    
      2.40000           4.80000         0.0345017        0.00505595    
      4.80000           10.0000         0.0354538        0.00638772