# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.276325        0.00513957    
     0.460000          0.700000          0.278484        0.00470941    
     0.700000           1.00000          0.330777        0.00567376    
      1.00000           1.54000          0.433373        0.00837649    
      1.54000           2.40000          0.425401         0.0132710    
      2.40000           4.80000          0.389231         0.0228782    
      4.80000           10.0000          0.324163         0.0465726