Fig. 2. Folded site frequency spectra (fSFS) of all seven studied species (inset) and of the remaining six species after excluding Pinus sylvestris (with adjusted scale in the y axis).

The SFS were transformed and normalized following⁸³ (see Materials & Methods) so that they are flat under the standard neutral model, facilitating the visualization of the SFS that depart from expectations of the standard neutral model^84,85. Source data are provided as a Source Data file-1.