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Technical chief James Allison has left Ferrari with immediate effect.
Allison rejoined Ferrari from Lotus three years ago as part of a restructuring plan and under his control the team recorded three victories in 2015.
However, Ferrari have been unable to build on the progress they made last season and have yet to win a race this year and are currently just one point ahead of Red Bull in the battle for second in the constructors' championship.
"During the years I spent at Ferrari, at two different stages and covering different roles, I could get to know and appreciate the value of the team and of the people, women and men, which are part of it," Allison said., who was head of aerodynamics at Ferrari from 2000 to 2004.
"I want to thank them all for the great professional and human experience we shared. I wish everybody a happy future with lots of success."
Ferrari team principal Maurizio Arrivabene added: "The team would like to thank James for his commitment and sacrifice during the time spent together, and wishes him success and serenity for his future endeavours."
Mattia Binotto will take over as Chief Technical Officer.
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