To the right of Duke Nukem, on the big floating boulder of Poignée d'Amour. Sitstart just left of the arete, climb the overhang and exit directly.
NB: another sit start at the bottom and to the right of the arete is possible. Right hand on a small crimp, left foot at the bottom of the arete and right foot (toe or heel) on the good crimp, in the face, on the right; a little more difficult.