# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0371544         0.0357934    
     0.460000          0.700000              -NaN              -NaN    
     0.700000           1.00000         0.0121400         0.0301457    
      1.00000           1.54000         0.0563615         0.0218465    
      1.54000           2.40000          0.118155         0.0162850    
      2.40000           4.80000          0.197804        0.00662452    
      4.80000           10.0000          0.149150        0.00611886