Pulsation parameters for the pressure mode of radial order n = 4 for selected models. Upper panel: normalised growth rate. Lower panel: work performed by one pulsation cycle. The inset in the lower panel shows the Kiel diagram of the three corresponding evolutionary tracks (coloured lines) and the accreting evolutionary track (black dash dotted line). Also shown is the p-mode instability region for any modes (gray area) and the boundary for high η as in Fig. 11. The upper and lower panel also include the temperature ranges of the boundary (grey area) and the effective temperatures of observed pre-main sequence stars (green area) which overlap.