# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.270602        0.00396079    
     0.460000          0.700000          0.284068        0.00365138    
     0.700000           1.00000          0.324985        0.00510907    
      1.00000           1.54000          0.309691        0.00519616    
      1.54000           2.40000          0.281793        0.00578443    
      2.40000           4.80000          0.219922        0.00680602    
      4.80000           10.0000          0.178318        0.00844158