# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0265825         0.0216812    
     0.460000          0.700000          0.124988         0.0114384    
     0.700000           1.00000          0.130575        0.00755292    
      1.00000           1.54000          0.137304        0.00432444    
      1.54000           2.40000          0.138938        0.00357325    
      2.40000           4.80000          0.141821        0.00392609    
      4.80000           10.0000          0.125471        0.00486891