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Vadivelu averages 6.76, Devayani averages 7.09. Apart that suggests 6.93; together they average 7.90, a lift of +0.98.
Lift is the average of their films together minus the mean of their two career averages.
Dot size shows IMDb votes; lines are rolling five-film averages. Films with fewer than 1,000 votes are left out.