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Barcelona F1 test day four
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Ericsson on the move too, the Swede goes third on a 1m32.024s.
Gasly finds over a second that time round but stays second on a 1m31.527s.
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1m31.204s that time by from Bottas, who now sits 1.590s clear of Gasly.
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The times really are starting to tumble now, no surprise with track temps now up to 27C. Bottas improves to a 1m31.665s, while Gasly jumps to second on a 1m32.794s.
Ericsson has moved up to sixth with a new personal best of 1m34.940s.
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Bottas finds a hefty chunk of time there as he sets a 1m32.081s to go nine tenths clear of Verstappen.
Verstappen improves next time by, but stays second with a 1m32.982s.
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Moments later, Bottas knocks Verstappen off the top spot with a 1m32.916s.
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Verstappen is not messing around. He goes straight to P1 with his first timed lap of the day, a 1m33.016s, set on inters.
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Hulkenberg finds another tenth with a 1m33.059s. That's 0.455s up on the field.
Verstappen is on track and has even - wait for it - started a flying lap!
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Hulkenberg deposes Magnussen and goes quickest with a 1m33.178s. He's still on inters, but we noticed him taking an unusual line along the straight - presumably to keep the tyres cool. Surely it's time for someone to give slicks a go...
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Hulkenberg goes second with a 1m33.633s, setting a purple first sector, and it looks like this next one could be a quick one too...
Sirotkin likewise sets a new personal best in the Williams, but it's not enough to lift him from P8.
In less exciting news, Ericsson has improved in the Sauber, but stays in P7.
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Magnussen in P1! It's a 1m33.514s by the Dane, who goes 0.260s clear of Bottas.
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Gunther Steiner looking suitably impressed as Magnussen goes second for Haas (LAT Images)
Magnussen got our hopes up there with a purple first sector, but he falls 0.178s short of Bottas. He does however clear Vandoorne and Hulkenberg to go second.
It's getting tight at the top now, as Magnussen gets within 0.633s of the pace but stays fourth.
Again Hulkenberg finds more time, a 1m34.242s that time. That puts him within a sniff of Vandoorne's second-placed time.
Hulkenberg quicker again that time, a 1m34.459s, Magnussen jumps to fourth on a 1m35.344s.
Hulkenberg doesn't improve on his next lap, but does set a purple final sector. Magnussen meanwhile has gone sixth on a 1m36.607s, moving ahead of Ericsson.
Hulkenberg goes third on a 1m34.941s, slotting in behind Bottas and Vandoorne. He's on inters.
Hulkenberg heads back out in the Renault, followed by the Haas of Magnussen.
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Gasly taking advantage of the improving conditions to set a new personal best of 1m36.181s, but he stays fourth. Ericsson remains fifth on a 1m37.162s.
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Lap count update:
Vandoorne 58
Sirotkin 40
Ericsson 39
Bottas 38
Vettel 35
Gasly 31
Hulkenberg 20
Magnussen 16
Perez 9
Verstappen 5
Vandoorne 58
Sirotkin 40
Ericsson 39
Bottas 38
Vettel 35
Gasly 31
Hulkenberg 20
Magnussen 16
Perez 9
Verstappen 5
Vandoorne has come in, so that's 58 laps done for him today. We'll provide a full update while the track is relatively quiet.
Ericsson moves up another place with a 1m37.505s.

Stroll is set to take over the Williams from Sirotkin this afternoon
Ericsson goes up to sixth on a 1m38.069s.
Inters are still the tyre of choice for now, but it's probably not going to be too long before someone rolls the dice and bolts on some slicks.
Gasly and Ericsson have now joined Vandoorne on track, which is warming up nicely now with a bit of sun beating down on that freshly-laid tarmac.
Vandoorne drops time in the last sector, but it's still a new personal best of 1m34.226s by the Belgian.
Purple first sector alert for Vandoorne!
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By: Geoff Creighton
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