Under F1's new sporting regulations, teams have to assign at least one day of pre-season testing to wet weather work for Pirelli.
That had originally been pencilled in for Friday this week, but the damp start to the second day of testing on Tuesday meant that plan has been revised.
Pirelli has decided that Wednesday will now be devoted to wet weather running, with the track being artificially wetted throughout the day.
Although a day of wet weather running may not seem ideal for teams, the early preparation work that is being done on engine reliability and understanding means that it will not impact much on their programmes.
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