# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0970446        0.00547217    
     0.460000          0.700000         0.0897363        0.00420278    
     0.700000           1.00000         0.0815176        0.00427021    
      1.00000           1.54000         0.0916527        0.00468510    
      1.54000           2.40000          0.100335        0.00577300    
      2.40000           4.80000          0.124994        0.00705928    
      4.80000           10.0000          0.138276         0.0118991