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Cross the river Drance de Ferret just under Les Granges, then follow the Nordic ski piste for several hundreds of metres. Go up to the right on a track, that you quickly leave, to reach the Lechère chalet. Climbing diagonally left brings you to a large slope, which you go up more or less directly, to a little cwm at the top of the crest of the Gouille. Follow this snow bowl to the Gouille and bypass it to the right of the crest of the Perche. Then go directly to the foot of the final slope, (N face) and climb it by the easiest line.
By the same way, many possibilities.
Negative slope values means the track is heading uphill.