# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0417760        0.00700940    
     0.460000          0.700000         0.0471249        0.00591439    
     0.700000           1.00000         0.0638202        0.00690444    
      1.00000           1.54000         0.0608989        0.00917568    
      1.54000           2.40000         0.0548842        0.00915063    
      2.40000           4.80000         0.0665743         0.0134528    
      4.80000           10.0000         0.0710648         0.0271104