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Barcelona F1 test day four
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Hamilton is back out, still running mediums - a tyre compound Mercedes seems happier than most to keep using. Magnussen heads out to join him.
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Stroll comes in after that productive first run, and the track falls silent.
Stroll moves up again - he's now ahead of Hulkenberg, who we declared the 'lunch' pacesetter as there wasn't a lunch break but we had to pick a time to publish a report on the first part of the day. As it turned out, his time at the top was short-lived as the track continued to improve after a wet start.
Verstappen moves up to 10th, circulating on the mediums. Only 31 laps in the books so far for the Red Bull today.
Bottas is the next car to fall behind Stroll as the Williams gradually moves up the order - he has 10 laps to his name now after taking over from Sirotkin.

Here's man on the move Stroll heading out for the first time a few moments ago (LAT Images)
The improvements keep on coming for Stroll - now he moves up to ninth.
Leclerc moves ahead of both Stroll and Verstappen moments later with a 1m23.9s.
Stroll moves above Verstappen with a 1m23.914s.
Leclerc kicks his day off with a 1m25.502s.
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Stroll improves again - now 7.5s off the pace - and stays 11th.
Stroll's next lap - only a 1m31.7s as he builds up slowly - moves him above Sirotkin's time that was set in wet conditions.
Stroll gets a time on the board, a 1m36.8s.
Vandoorne has cleared 100 laps today for McLaren.
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Perez moves up to fifth.
Vettel improves to a 1m20.692s, and stays second as Vandoorne's hypersoft time is still a fair bit down the road from that.
Stroll appears in the Williams for the first time today.
Vettel is running nicely in the low 1m21s now on softs, just a few tenths adrift of his best today.
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Gasly makes it five cars on track, joining Vandoorne, Vettel, Magnussen and Perez.
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After being passed by Vettel, Vandoorne backs off to fall seven seconds behind the Ferrari next time by.
Magnussen moves above Hamilton - who has now pitted - to take third in the Haas.
Vandoorne is back out, and has just been passed by Vettel on the start/finish straight as they both complete their out-laps.
Perez moves up again - he's now sixth.
Gary Anderson
I'm watching at Turn 7 and just caught Vandoorne losing the rear and having a run through the gravel. He carried on and headed back to the pits.
Perez quickly gets to work, moving up to eighth.
Fourth now for Magnussen - 1m21.764s to get within two seconds of the pace.
Perez reappears. He's only managed 20 laps so far today - and this is his first time in the Force India all week.
Magnussen picks off Bottas next to move into sixth. The Mercedes man won't be responding to that now he's handed his car over to Hamilton for the afternoon.
Magnussen moves up a place with a 1m23.509s on softs.
Hamilton moves up to third, 1.3s adrift of the pace set by Vandoorne (mediums v hypersofts).
Leclerc appears for the first time today, while Magnussen and Vandoorne head back out to join Hamilton on track.

Gasly back in the pits, he's placed third at the moment after those laps
Hamilton jumps from 10th to fifth with a 1m22.7s.
Hamilton has the track to himself at the moment. Some teams will be stopping for a quick lunch, while others have driver changes planned for the afternoon, either as part of their original plans for this week, or to make up for lost running for one driver due to weather.
Hamilton's first time of the day is a 1m27.2s, enough to move him ahead of Sirotkin's time from the damp morning.
By: Geoff Creighton
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