  Recent studies have established that peaks in solar oscillation power spectra
are not Lorentzian in shape, but have a distinct asymmetry. Fitting a symmetric
Lorentzian profile to the peaks therefore produces a shift in frequency of the
modes. Accurate determination of low-frequency modes is essential to infer the
structure of the solar core by inversion of the mode frequencies. In this paper
we investigate how the changes in frequencies of low-degree modes obtained by
fitting symmetric and asymmetric peak profiles change the inferred properties
of the solar core. We use data obtained by the Global Oscillations at Low
Frequencies (GOLF) project on board the SoHO spacecraft. Two different solar
models and inversion procedures are used to invert the data to determine the
sound speed in the solar core. We find that for a given set of modes no
significant difference in the inferred sound-speed results from taking
asymmetry into account when fitting the low-degree modes.
