Rotate camera with easeout

Hello! I've a script that rotates my camera the more fast the more the mouse reaches the screen boders.

                 float xMouse = Input.mousePosition.x;
         
                 float x1 = Screen.width * 30 / 100;
                 float x2 = Screen.width * 70 / 100;
 
                 float maxSpeed = 60.0f;
                 float div = 50000.0f;
 
                 if (xMouse < x1) {
                         float ang_speed = Mathf.Min (maxSpeed * ((x1 - xMouse) * (x1 - xMouse) / div), maxSpeed);
                         Camera.main.transform.RotateAround (Vector3.zero, -Vector3.up, ang_speed * Time.deltaTime);
                 }
         
                 if (xMouse > x2) {
                         float ang_speed = Mathf.Min (maxSpeed * ((xMouse - x2) * (xMouse - x2) / div), maxSpeed);
                         Camera.main.transform.RotateAround (Vector3.zero, Vector3.up, ang_speed * Time.deltaTime);
                 }

It works well but when i move the mouse towards center of screen the rotation stops instead of slowing down... Some help plz?