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One of the most heavily developed areas of the car, the barge boards have shown numerous changes over the season. The last one in Japan is small but significant and relates to a visible increase in the height (blue arrow) of the 'upper step' of the main shield in front of the boards. Varying the height of the saw-tooth profile helps in reducing turbulence and improving engine cooling relative to the varying needs of each track. The change is very subtle, but nonetheless relevant in terms of reliability - so crucial at this stage of the season.