
Marcus Ericsson (SWE) Alfa Romeo Sauber C37 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Charles Leclerc (MON) Alfa Romeo Sauber F1 Team at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Romain Grosjean (FRA) Haas VF-18 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Pierre Gasly (FRA) Scuderia Toro Rosso STR13 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Marcus Ericsson (SWE) Alfa Romeo Sauber C37 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Sergey Sirotkin (RUS) Williams FW41 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Jerry Andre/Sutton Images

Sebastian Vettel (GER) Ferrari SF-71H at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Valtteri Bottas (FIN) Mercedes-AMG F1 W09 EQ Power+ at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Sergey Sirotkin (RUS) Williams FW41 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Jerry Andre/Sutton Images

Stoffel Vandoorne (BEL) McLaren MCL33 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Jerry Andre/Sutton Images

The car of Marcus Ericsson (SWE) Alfa Romeo Sauber C37 is recovered from the gravel at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Marcus Ericsson (SWE) Alfa Romeo Sauber F1 Team hitches a lift back to the pits at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Kevin Magnussen (DEN) Haas VF-18 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Jerry Andre/Sutton Images

Sergio Perez (MEX) Force India VJM11 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Jerry Andre/Sutton Images

Fans watch Sebastian Vettel (GER) Ferrari SF-71H at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Paul Monaghan (GBR) Red Bull Racing Chief Engineer and Red Bull Racing mechanics at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Marcus Ericsson (SWE) Alfa Romeo Sauber C37 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Valtteri Bottas (FIN) Mercedes-AMG F1 W09 EQ Power+ at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Toto Wolff (AUT) Mercedes AMG F1 Director of Motorsport at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Red Bull Racing RB14 front wing at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Red Bull Racing RB14 rear detail at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Alfa Romeo Sauber F1 Team mechanic at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Sebastian Vettel (GER) Ferrari SF-71H at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Jerry Andre/Sutton Images

Marcus Ericsson (SWE) Alfa Romeo Sauber F1 Team talks with the media at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Lewis Hamilton (GBR) Mercedes-AMG F1 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Lewis Hamilton (GBR) Mercedes-AMG F1 W09 EQ Power+ at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Sergio Perez (MEX) Force India VJM11 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Charles Leclerc (MON) Alfa Romeo Sauber C37 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Carlos Sainz jr (ESP) Renault Sport F1 Team at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Kevin Magnussen (DEN) Haas VF-18 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Sebastian Vettel (GER) Ferrari SF-71H at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Jock Clear (GBR) Ferrari Chief Engineer at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Sergio Perez (MEX) Force India VJM11 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Stoffel Vandoorne (BEL) McLaren MCL33 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Max Verstappen (NED) Red Bull Racing RB14 in the gravel at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Max Verstappen (NED) Red Bull Racing RB14 span into the gravel at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Max Verstappen (NED) Red Bull Racing walks in after spinning into the gravel at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images

Sergio Perez (MEX) Force India VJM11 at Formula One Testing, Day Four, Barcelona, Spain, 1 March 2018. © Mark Sutton/Sutton Images
With Wednesday's snow gone, it was a damp and somewhat warmer Circuit de Barcelona-Catalunya that greeted the teams on Thursday...
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