Input (grade 13): Above the forestry, there is often a band of short pine trees (Pinus mugo), which is in turn superseded by dwarf shrubs, typically Rhododendron ferrugineum (on acid soils) or Rhododendron hirsutum (on alkaline soils).
Output (grade 7): Above the tree line, there is often a band of dwarf pine trees (Pinus mugo), which is taking place of dwarf shrubs. These shrubs are Rhododendron ferrugineum (on acid soils) or Rhododendron hirsutum (on non-acid soils).