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.
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Robert Kubica (POL) Williams Racing FW42.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Lando Norris (GBR) McLaren MCL34.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Antonio Giovinazzi (ITA) Alfa Romeo Racing C38.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Robert Kubica (POL) Williams Racing FW42.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Charles Leclerc (MON) Ferrari SF90.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Alexander Albon (THA) Scuderia Toro Rosso STR14.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Red Bull Racing RB15 - sensor equipment at the rear suspension.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Lewis Hamilton (GBR) Mercedes AMG F1 W10.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Lando Norris (GBR) McLaren MCL34 in the gravel trap.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Lando Norris (GBR) McLaren MCL34 in the gravel trap.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Romain Grosjean (FRA) Haas F1 Team VF-19.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Robert Kubica (POL) Williams Racing FW42.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Charles Leclerc (MON) Ferrari SF90.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Pietro Fittipaldi (BRA) Haas F1 Team Test Driver.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Romain Grosjean (FRA) Haas F1 Team VF-19.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Antonio Giovinazzi (ITA) Alfa Romeo Racing C38.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Lando Norris (GBR) McLaren MCL34.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Max Verstappen (NLD) Red Bull Racing RB14.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Lance Stroll (CDN) Racing Point F1 Team RP19.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Lance Stroll (CDN) Racing Point F1 Team RP19.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Alexander Albon (THA) Scuderia Toro Rosso STR14.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Alexander Albon (THA) Scuderia Toro Rosso STR14.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Lance Stroll (CDN) Racing Point F1 Team RP19.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Lando Norris (GBR) McLaren MCL34.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Charles Leclerc (MON) Ferrari SF90.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Antonio Giovinazzi (ITA) Alfa Romeo Racing C38.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Pietro Fittipaldi (BRA) Haas F1 Team Test Driver.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Robert Kubica (POL) Williams Racing FW42.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Robert Kubica (POL) Williams Racing.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Charles Leclerc (MON) Ferrari SF90 runs into the gravel trap.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Charles Leclerc (MON) Ferrari.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Kevin Magnussen (DEN) Haas VF-19.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Lance Stroll (CDN) Racing Point F1 Team RP19.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Lando Norris (GBR) McLaren MCL34.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Alexander Albon (THA) Scuderia Toro Rosso STR14.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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George Russell (GBR) Williams Racing with the media.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Lando Norris (GBR) McLaren MCL34.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Lance Stroll (CDN) Racing Point F1 Team RP19.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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Robert Kubica (POL) Williams Racing with the media.
21.02.2019. Formula One Testing, Day Four, Barcelona, Spain. Thursday.
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