Halfway through the first test and a quarter of the way through pre-season testing overall, what have we made it of so far?
Mercedes and Ferrari must be close to receiving full marks, Red Bull are still giving little away about their full capabilities, McLaren have lurched from one major setback to another, Haas and Force India have done well, and Renault not quite so well.
But there, is ever, no real certainty around any of these conclusions given testing’s notorious habit of dropping false clues and a long, long way to go…
A quick update from Sky F1's Ted Kravitz:
"Watching the cars this morning, it's clear that there is still more understanding to be done about these air-flow structures and how they work around the rear wing. Both Red Bull and Mercedes are running with very serious air flow sensor rakes."
"On the Mercedes, this is around two different places.
"Firstly around the diffuser and the gap between the floor and the rear wheels. This is a crucial part of any of car design to eliminate what is called tyre squirt where air flow brought up from the rotating tyre interferes with the top of the floor.
"The other area where Mercedes have sensors is on top of the engine cover, just in front of their so-called 'T-Wing' - which in Mercedes' case looks like an upside down coat hanger. These devices, although legal, are beginning to look ever more fragile and l wouldn't be at all surprised if they are banned before Melbourne."