# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0632912        0.00336021    
     0.460000          0.700000         0.0744711        0.00278455    
     0.700000           1.00000          0.104770        0.00342552    
      1.00000           1.54000          0.111525        0.00411317    
      1.54000           2.40000          0.135116        0.00518112    
      2.40000           4.80000          0.112159        0.00766710    
      4.80000           10.0000         0.0590756         0.0126690