Amplitudes of radial modes as a function of frequency for HD 52265. Crosses correspond to values obtained by fitting the same intrinsic amplitudes for modes (l = 1,   n − 1) and (l = 0,   n), i.e. fit A, whereas plus signs correspond to values obtained by fitting same intrinsic amplitudes for modes (l = 1,   n) and (l = 0,   n), i.e. fit B. Amplitudes are plotted as a function of the mean frequency of the two modes. The dashed line shows the amplitudes of radial modes deduced from the fit as a Gaussian profile of the p-mode power excess (see Sect. 5). Grey area indicates the associated 1-σ error bars. The green curve shows the amplitudes of radial modes deduced from the spectrum smoothed by a -wide boxcar, after subtracting the background.