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Kimi Raikkonen ended day one of Barcelona Formula 1 testing frustrated as a data issue limited Lotus's mileage.
Raikkonen was second quickest, just 0.007 seconds behind pacesetter Nico Rosberg's Mercedes.
But the Finn's tally of 44 laps was the lowest of the day, as problems with data-logging diagnostics interrupted Lotus's programme.
"We only did short runs," said Raikkonen.
"We couldn't get any data from the car so we couldn't run many laps because we couldn't see if anything was wrong or not."
Raikkonen said the disruption was minimised because Tuesday would not have been the most useful day of running.
"The circuit is not in very good condition and it's too cold still," he said.
Lotus will keep Raikkonen in the car for Wednesday before Romain Grosjean takes over for the remainder of the week.
