Write SQL query to solve given problem: What is the average salary of the employees who takes charge of the sales of over 4 territories?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT AVG(T1.Salary) FROM Employees AS T1 INNER JOIN EmployeeTerritories AS T2 ON T1.EmployeeID = T2.EmployeeID GROUP BY T1.EmployeeID HAVING COUNT(T2.TerritoryID) > 4