Teams entered their fourth and last day of Week 1 of pre-season testing at the Circuit de Catalunya on Friday.

As everyone gets a grip on development, the pace and performance is ramping up, as the time-sheets attest.

Here's a recap in pictures of the day's action in Barcelona.

Robert Kubica (POL) Williams Racing banners in the grandstand. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Batchelor / XPB Imagesmore
Robert Kubica (POL) Williams Racing FW42. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Charniaux / XPB Imagesmore
Lando Norris (GBR) McLaren MCL34. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Antonio Giovinazzi (ITA) Alfa Romeo Racing C38. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Robert Kubica (POL) Williams Racing FW42. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Charles Leclerc (MON) Ferrari SF90. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Alexander Albon (THA) Scuderia Toro Rosso STR14. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Red Bull Racing RB15 - sensor equipment at the rear suspension. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Batchelor / XPB Imagesmore
Lewis Hamilton (GBR) Mercedes AMG F1 W10. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Charniaux / XPB Imagesmore
Lando Norris (GBR) McLaren MCL34 in the gravel trap. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Charniaux / XPB Imagesmore
Lando Norris (GBR) McLaren MCL34 in the gravel trap. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Charniaux / XPB Imagesmore
Romain Grosjean (FRA) Haas F1 Team VF-19. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Charniaux / XPB Imagesmore
Robert Kubica (POL) Williams Racing FW42. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Charniaux / XPB Imagesmore
Charles Leclerc (MON) Ferrari SF90. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Charniaux / XPB Imagesmore
Pietro Fittipaldi (BRA) Haas F1 Team Test Driver. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Bearne / XPB Imagesmore
Romain Grosjean (FRA) Haas F1 Team VF-19. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Charniaux / XPB Imagesmore
Antonio Giovinazzi (ITA) Alfa Romeo Racing C38. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Charniaux / XPB Imagesmore
Lando Norris (GBR) McLaren MCL34. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Charniaux / XPB Imagesmore
Max Verstappen (NLD) Red Bull Racing RB14. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Charniaux / XPB Imagesmore
Lance Stroll (CDN) Racing Point F1 Team RP19. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Charniaux / XPB Imagesmore
Lance Stroll (CDN) Racing Point F1 Team RP19. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Alexander Albon (THA) Scuderia Toro Rosso STR14. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Alexander Albon (THA) Scuderia Toro Rosso STR14. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Lance Stroll (CDN) Racing Point F1 Team RP19. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Lando Norris (GBR) McLaren MCL34. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Charles Leclerc (MON) Ferrari SF90. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Antonio Giovinazzi (ITA) Alfa Romeo Racing C38. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Pietro Fittipaldi (BRA) Haas F1 Team Test Driver. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Batchelor / XPB Imagesmore
Robert Kubica (POL) Williams Racing FW42. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Batchelor / XPB Imagesmore
Robert Kubica (POL) Williams Racing. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Bearne / XPB Imagesmore
Charles Leclerc (MON) Ferrari SF90 runs into the gravel trap. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Batchelor / XPB Imagesmore
Charles Leclerc (MON) Ferrari. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Kevin Magnussen (DEN) Haas VF-19. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Batchelor / XPB Imagesmore
Lance Stroll (CDN) Racing Point F1 Team RP19. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Batchelor / XPB Imagesmore
Lando Norris (GBR) McLaren MCL34. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Batchelor / XPB Imagesmore
Alexander Albon (THA) Scuderia Toro Rosso STR14. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Batchelor / XPB Imagesmore
George Russell (GBR) Williams Racing with the media. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Bearne / XPB Imagesmore
Lando Norris (GBR) McLaren MCL34. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Lance Stroll (CDN) Racing Point F1 Team RP19. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Robert Kubica (POL) Williams Racing with the media. 21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday. - www.xpbimages.com, EMail: requests@xpbimages.com - copy of publication required for printed pictures. Every used picture is fee-liable. © Copyright: Moy / XPB Imagesmore
Michael Delaney

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