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Barcelona F1 test day four
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Vandoorne has now ousted Sirotkin for third with a 1m38.817s, but that's still the thick end of 2s off the pace.
Seconds later, Hulkenberg jumps to fifth on a 1m41.037s. After yesterday's dearth of running, all these laptimes coming in are a bit of a shock to the system...
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Now Gasly leapfrogs Hulkenberg to go sixth with a 1m41.822s. Interestingly, he's still on wets.
More PBs for Sirotkin, Vandoorne and Gasly, who remain third, fourth and seventh respectively.
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Bottas goes quicker still on a 1m36.846s. Vettel improves to a 1m37.392s, but remains second.
More personal bests too for Sirotkin, Vandoorne, Hulkenberg and Gasly, but nothing that lifts them from their current positions.
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Bottas takes over at the top of the times with a 1m37.118s, a full 0.656s up on Vettel.
Sirotkin has cleared Vandoorne for third with a 1m39.065s.
Hulkenberg now climbs to sixth on a 1m42.678s.
Bottas joins the fun with a 1m37.837s, less than a tenth shy of Vettel.
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Improvements coming thick and fast now - Vettel goes quicker again on a 1m37.774s, Vandoorne goes third on a 1m40.116s and fourth-placed Sirotkin sets a 1m40.547s.
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Vettel with a very slight improvement of 1m38.204s at the top of the timing screens, as Vandoorne improves to a 1m40.867s and jumps Perez for fourth.
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Here's a lap count update:
Vandoorne 35
Sirotkin 23
Ericsson 21
Vettel 19
Bottas 12
Magnussen 8
Perez 7
Hulkenberg 7
Gasly 5
Verstappen 1
Vandoorne 35
Sirotkin 23
Ericsson 21
Vettel 19
Bottas 12
Magnussen 8
Perez 7
Hulkenberg 7
Gasly 5
Verstappen 1
Bottas keeps chipping away, setting a 1m38.906s to get back within a second of Vettel.
Only Verstappen in the Red Bull who has yet to do a timed lap so far...
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Bottas cuts the deficit to 1.041s with his last lap, before Vettel stretches it out again with a new quickest time of 1m38.239s.
Perez improves, but stays fourth, while Magnussen has set a first timed lap 25s off the pace as he focuses on straight line work.
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It's a 1m38.536s that time by for Vettel, putting him nearly two seconds up on Bottas.
Bottas goes quicker with a 1m40.386s, 0.595s shy of Vettel's best time.
Another improvement by Perez, a 1m42.349s, but he stays fourth.
Busy track now, with Vettel, Bottas, Perez, Ericsson and Magnussen all out there. Inters are the most popular choice, but Perez and Magnussen are sticking to wets.
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Vettel delivers our first sub-1m40s effort of the day, a 1m39.791s.
Bottas moves ahead of Sirotkin into second place with a 1m40.470s - just 0.061s splitting he and Vettel now at the top. Perez has gone fourth fastest (on wets) on his first flying lap of the day.
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Vettel briefly knocked down to third by Bottas, but next time round he goes fastest with a 1m40.409s - four tenths up on Sirotkin. Bottas's time was a 1m41.619s.
Vettel now within a second of the pace on a 1m41.805s.
Bottas's first timed lap of the day of 1m43.141s puts him fourth. He's on inters.
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Vettel goes up to second now with a 1m42.835s, which puts him within two seconds of Sirotkin's early benchmark.
Another modest improvement by Vettel - a 1m44.277s that time - as Bottas heads back out. Sirotkin has pitted.

Vettel's been edging closer on intermediates, but Sirotkin's wet-tyre time remains the current benchmark
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Vettel jumps to third with his latest effort of 1m44.411s, a shade under 4s off the pace.
Vettel sets a new personal best of 1m45.057s on his inters. Hulkenberg has pitted.
Vandoorne is on inters, but Hulkenberg is still on full wets. The former has improved to a 1m42.944s.

Vettel trying out intermediates

Current pacesetter Sirotkin viewed from a sneaky angle (Sutton Images)
Vandoorne improves to a 1m43.111s, keeping him second, while Hulkenberg's first flying lap of the day - a 1m44.511s - puts him third.
By: Geoff Creighton
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