Goodland ( 1971 ) divided the Cerrado into four categories ranging from least to most canopy cover : " campo sujo " ( herbaceous layer with occasional small trees about 3 m tall ), " campo cerrado " ( slightly higher density of trees about 4 m tall on average ), " cerrado sensu stricto " ( orchard-like vegetation with trees about 6 m high ) and " cerradao " ( canopy cover near 50 % with general height 9 m ).
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