12496890_Alpine_Grades_for_Ski_Alpinism__1
[0] - Difficult D + [2] Long slide ways, partly into blocks, rubble, trees. (danger of death if snow is icy!) [3] Long and steep narrow spots. Short, quick turns still possible [4] Around 40° [1] 
Steep slopes, many obstacles require good skiing skills
Alpine Grades for Ski Alpinism
1