Note: when compared to other resources and names on the start of the routes, it looks like that the topo of this sector is incorrect. indeed this very route likely isnt shown at all on the topo. it is the rightmost route on the edge of the left wall of this sector, right next to mèurra (no. 17 in topo). 4a feels about right...

Note: pubusa is actually on the ridge to the right of route 17 in this guide