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At the last round in China Ferrari tweaked their diffuser, inclining its outermost fence outwards so as to create a trapezoidal shape to the channel. In Brazil the team have reverted to the previous version, with the usual vertical outer fence attached to the diffuser via a rounded connecting profile (red arrows). This design was considered advantageous at Interlagos due to its reduced sensitivity to the ride height variations caused by the bumpy track surface (though the bumps have been reduced this year through resurfacing).