# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000         0.0692120         0.0824706    
      1.00000           1.54000          0.398257         0.0798524    
      1.54000           2.40000          0.327287         0.0294332    
      2.40000           4.80000          0.207265         0.0146142    
      4.80000           10.0000          0.175734         0.0141191