# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00431250        0.00285988    
     0.460000          0.700000        0.00572140        0.00223688    
     0.700000           1.00000        0.00770315        0.00238830    
      1.00000           1.54000        0.00246886        0.00312851    
      1.54000           2.40000        0.00594944        0.00265884    
      2.40000           4.80000        0.00209138        0.00438548    
      4.80000           10.0000         0.0107015        0.00350380