# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0888519        0.00184306    
     0.460000          0.700000         0.0983065        0.00171032    
     0.700000           1.00000          0.105805        0.00195225    
      1.00000           1.54000          0.124254        0.00242405    
      1.54000           2.40000          0.127076        0.00357278    
      2.40000           4.80000          0.135530        0.00537905    
      4.80000           10.0000          0.148990        0.00973993