Looks like it´s touching the ground here,
But obviously the nay sayers would want me to fly to Australia, analyse the ground for paint or carbon, break into RBR headquartes, scrape of some paint and carbon, run to a specialist, do some tests, confirm that the carbon actually came from RBR´s front wing... GIVE ME A BREAK.
2cm... In lala land it´s 2cm, in the real world it´s close to 5.
Wing is designed to bridge the gap to the ground and thus making it efficient.
The bullshit about Rake that Horner say is disproven by watching a stationary pic of the car since the rake could only get less in higher speeds.
The truth will come out...