12496890_Alpine_Grades_for_Ski_Alpinism__1
[0] - Not Very Difficult PD + [2] Short steep sections with gentle run outs [3] Bottlenecks are short and not steep. [4] Around 30° [1] 
Usually open slopes with some short steep steps, quick turns might be necessary to avoid some obstacles
Alpine Grades for Ski Alpinism
1