The braincase , being only NUMBER@1 cm ³ to NUMBER@2 cm ³ in volume is similar to that of extant chimpanzees and is notably less than the approximate human volume of NUMBER@3 cm ³ .

The braincase is only NUMBER@1 cm ³ to NUMBER@2 cm ³ in volume , about the same as chimpanzees . It is much less than the human volume of about NUMBER@3 cm ³ .
