# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.122054        0.00803240    
     0.460000          0.700000          0.136593        0.00867002    
     0.700000           1.00000          0.161682         0.0115079    
      1.00000           1.54000          0.193871         0.0147009    
      1.54000           2.40000          0.177229         0.0198268    
      2.40000           10.0000          0.155071         0.0273206