The first test ahead of the 2017 Formula 1 season was always going to produce as many questions as answers. With a new generation of car being ushered in and the likes of Renault and Honda overhauling their engine designs to try and catch Mercedes, the pre-season has not been short of talking points.
Halfway through testing and we've had the first few indicators of what we can expect from the coming campaign, be they from trackside observations or paddock chatter.
The 10 teams will be spending another four days at Barcelona next week, so there is plenty of scope for things to change before the season-opening Australian Grand Prix takes place on March 26.