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The Williams team unveiled on Thursday its definitive colour scheme for the 2011 season

The Grove-based squad unveiled its 2011 challenger, the FW33, earlier this month and has been running with an interim livery during winter testing.

But its final colour scheme was only presented to the public in an event broadcast online on Thursday morning.

The most visible sponsorship on the car is from energy company Petroleos de Venezuela (PDVSA), with which the team announced a "substantial" deal earlier this year, and from temporary employment company Randstad.

Williams's livery resembles that used by the team back in the 1990s, when it was sponsored by Rothmans.

The car will be driven by Venezuelan Pastor Maldonado and Brazilian Rubens Barrichello.