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..."under optimal conditions grows to 18–40 metres (59–131 ft) tall with a trunk diameter of about 60 centimetres (24 in), though exceptional specimens can reach 46 m (151 ft) tall and 30 cm (12 in) diameter"... I would think that the taller tree would also be larger in diameter, not half sized, but I am no botanist. Gimelgort (talk) 23:46, 21 June 2014 (UTC)