# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0440999        0.00276529    
     0.460000          0.700000         0.0476195        0.00316360    
     0.700000           1.00000         0.0445989        0.00389977    
      1.00000           1.54000         0.0657492        0.00379654    
      1.54000           2.40000         0.0587838        0.00572806    
      2.40000           4.80000         0.0670585        0.00770354    
      4.80000           10.0000         0.0353864         0.0106978