# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000         0.0131907         0.0255259    
      1.00000           1.54000         0.0828154         0.0277393    
      1.54000           2.40000          0.146272         0.0405649    
      2.40000           4.80000          0.148399         0.0525587    
      4.80000           10.0000         0.0836963         0.0367120