# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0180019        0.00847692    
     0.460000          0.700000         0.0246415        0.00703453    
     0.700000           1.00000         0.0300853        0.00924153    
      1.00000           1.54000         0.0104963         0.0172618    
      1.54000           2.40000         0.0317245         0.0153863    
      2.40000           10.0000         0.0134846         0.0248010