Formula 1 pre-season testing is drawing to a close, with only one day left to run before the teams have to pack up, ship out, and head to Australia for the first race of the new campaign.
Time is running short to understand this new breed of F1 car, fine-tune set-ups, gather data, unlock performance, and validate reliability.
It's always difficult to read the emerging competitive picture, skewed as it is by variations in engine settings, aerodynamic configurations, fuel loads, tyre types, run plans, and even the occasional bit of sandbagging, as was the case with Sebastian Vettel on day seven at Barcelona.