# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0554791         0.0183371    
     0.460000           1.54000         0.0165666         0.0107670    
      1.54000           2.40000         0.0183990         0.0120301    
      2.40000           4.80000         0.0241751        0.00683271    
      4.80000           10.0000         0.0219131        0.00824827