The loop:
Les Bugnenets - Creux Joly - Quatre Bornes - La Clochette - Les Bugnenets
has been just done. About 9.5km, about 2 hours.
Temperature was ok, except these windy moments when my jacket was becoming an icy armour
The conditions where excellent: coudless sky with 0.7 shining moon, frosty white trees and discrete sounds of animals from the forest

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Because of the moon, the headlamp was not necessary this time - definitively I must plan a full moon walk.