12496890_Alpine_Grades_for_Ski_Alpinism__1
[0] - Very Difficult TD + [2] Slide ways with steep steps, cliffs (mortal danger!) [3] Long and very steep couloirs. Often jump turns and side slipping necessary. [4] around 45° [1] 
Generally very steep terrain, often with interspersed rock steps, many obstacles
Alpine Grades for Ski Alpinism
1