Analysing terrain data
The exposure grade does not take into account objective hazards (stone fall, seracs, etc) but only the consequences of the skier falling.
Low Exposure (E1): Exposure is limited to that of the slope itself. Getting hurt is still likely if the slope is steep and/or the snow is hard.
Medium Exposure (E2): As well as the slope itself, there are some obstacles (such as rock outcrops) which could aggravate injury.
High Exposure (E3): In case of a fall, death is highly likely.
Extreme Exposure (E4): In case of a fall, the skier faces certain death.
Take the Cable car to the top of the Aguille Rouge.
From here you need to enter les Cables Couloir from the very top but start traversing left to reach a wide face which is the Arandelieres bowl.
You can work your way across this face being careful to no go near the cliffs, This is a no fall zone as you are above a large cliff band to start with until you reach the northwest facing couloir, only then should you ski the fall line until you reach the piste. Be careful on this line as there are people below you, if there has been recent snowfall then it's easy to set off slides or sluff which could endanger the people below. The other option to reach this face is to hike directly along the ridgeline from the cablecar, this is a long and very exposed walk with a lot of risk.
You do get to ski the couloir from the very top though so if you are experienced then it could be a good route.