layer point to the Turboveg layer specification (see Turboveg Help) and column comb defines the aggregation.lc.0 = Use every layer differentiation from 0 to 9 in Turboveg database as pseudo-species.
lc.1 = Default layer combination in tv.veg. Differenciates tree and shrub layers, all other layers are combined.
lc.all = Do not use any layer differentiation.