Next I ran a supervised run of North Africans. The poles were:
Again populations from more agriculturally productive regions (Tunisia and N Morocco) lack significant Subsaharan segments as expected. Desert regions tend to present them in a chunky way which I ascribe not to slavery but to recent movement of desert tribe members anciently less affected by Neolithic migrations (Tuareg and others) into the coast and cities.
As for North Moroccans, much of the same applies, except that here some Northern influence is visible as well.
South Moroccan heterogeneity may be regional, due to fertile versus more desertic areas.
W Saharan's low homogeneous West-African-like elements may be aboriginal or otherwise ancient.
Together with my previous run, it appears to me that an Early Neolithic wave from the Nile spread West even as Egypt itself continued to receive Northeastern influences. This wave would maybe carry Berber languages. Later a second Nile wave would spread not only West but all over the Near East and Mediterranean.