# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0203285        0.00241547    
     0.460000          0.700000         0.0211247        0.00240821    
     0.700000           1.00000         0.0235292        0.00246341    
      1.00000           1.54000         0.0301732        0.00260841    
      1.54000           2.40000         0.0148262        0.00331532    
      2.40000           4.80000         0.0123307        0.00430763    
      4.80000           10.0000         0.0230455        0.00595738