Before revision:  The construction is based on a discretisation of the differential equation. Furthermore, we revisit the dynamics of the linkage equilibria between two neutral loci hitchhiking along with a selected one , and the dependence on the position of the selected site.
After revision:  The construction is based on a discretisation of the selection-recombination equation. We apply our method to systematically explain a long-standing observation concerning the dynamics of the linkage equilibria between two neutral loci hitchhiking along with a selected one , and the dependence on the position of the selected site.