# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0107718         0.0164944    
     0.460000          0.700000         0.0372323         0.0116528    
     0.700000           1.00000         0.0383200         0.0118239    
      1.00000           1.54000         0.0341570        0.00752966    
      1.54000           2.40000         0.0441783        0.00496475    
      2.40000           4.80000         0.0296062        0.00411636    
      4.80000           10.0000         0.0286153        0.00442409