Barcelona F1 test day four
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Sirotkin is back on track too now, as Ericsson goes quicker on a 1m47.250s and stays fifth.
Vandoorne and Hulkenberg are now both on track too.
More improvements by Vettel and Ericsson, but they remain third and fifth. Vettel's 1m46.230s still leaves him five seconds behind Sirotkin.
Magnussen chasing down Vandoorne for some wet-track wheel-to-wheel racing earlier (Sutton Images)
Vettel moves up to third with a 1m46.722s that time by. Ericsson improves to a 1m50.664s, but stays fifth.
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Air temperature is creeping up towards 10C - positively roasting compared to yesterday - while track temps are now nudging 15C. Humidity is still 96%, mind.
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Gary Anderson
I just had a good look at the Williams in the pits. It’s a complicated beast as far as the bits and pieces are concerned and they've got lots of parts doing lots of things aerodynamically around the bargeboard area. If they can get it all to work together, it’s all there. But they will probably need a good dry test to get that sorted and the drivers comfortable with it.
Vettel's first timed lap of the day is a 1m49.929s. He's the first driver to venture out on intermediates this morning.
Sirotkin pits, so it's just Vettel and Ericsson circulating now.
After his earlier trip to the gravel, Ericsson is back out in the Sauber.
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Stopwatch
Big improvement that time by for Sirotkin, who logs a 1m40.838s.
Plenty of pictures from this morning's wet running already available in motorsport.com's gallery from Barcelona: 
Stopwatch
Sirotkin improves to a 1m42.333s, as Vettel heads out in the Ferrari.
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Sirotkin goes quickest on a 1m42.658s - 0.775s faster than Vandoorne.
Sirotkin now has the track to himself (LAT Images)
Hulkenberg pits without setting a timed lap, leaving Sirotkin all on his own. The Williams man sets a new personal best of 1m43.994s.
Vandoorne pits, having completed 26 laps this morning - more than double anyone else.
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Bottas pits, leaving us with Vandoorne, Sirotkin and Hulkenberg on track.
Hulkenberg goes out in the Renault as Magnussen pits.
First timed lap of the day from Bottas is a pedestrian 1m55.152s.
Magnussen is cruising along the straight, but Sirotkin is up to speed and improves to a 1m45.364s. He stays second.
Still your pacesetter - Vandoorne (LAT Images)
Sirotkin goes second on a 1m46.274s, 2.841s slower than Vandoorne. We now have Magnussen back on track too.
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Ericsson hitching a lift back to the pits after his earlier trip off the road (Sutton Images)
Sirotkin looks like he's up to speed this time, so expect a flying lap from the Russian shortly. Bottas is now heading out in the Mercedes.
Stopwatch
Vandoorne goes quicker yet again with a 1m43.433s.
Gasly pits, Sirotkin heads out.
Gasly finds a few seconds on his second timed lap of the day, which is a 1m46.935s.
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Vandoorne again with an improvement, a 1m45.077s that time.
Gasly goes second-fastest with his first time of the day, a 1m50.084s.
Stopwatch
Vandoorne improves to a 1m46.248s.
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By: Geoff Creighton
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