t <- tprTrees()
Dbh(t) # diameter in breast height (i.e. 1.3m)
Bhd(t) # same, german named function name
D13(t) # same, height related function name
D005(t) # diameter in 5% of tree height
D7(t) # diameter in height of 7m
D03(t) # diameter in 30% of tree height
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