2d obj look at limit in unity

I want the y-axis limits And Max and Min give Unknown

public Transform target; public GameObject player; public enum FacingDirection { UP = 100, DOWN = 90, LEFT = 100, RIGHT = 0 }

     void Update()
     {
         
         //LookAt2D(target);
 
         LookAt2D(target, 17f, FacingDirection.RIGHT);
  
     }
 
    
     // Other movement needs to be calculated first, so
     // we use LateUpdate() instead of Update().
     
 
 
     void LookAt2D(Transform theTarget, float theSpeed, FacingDirection facing)
     {
         Vector3 vectorToTarget = theTarget.position - transform.position;
         float angle = Mathf.Atan2(vectorToTarget.y, vectorToTarget.x) * Mathf.Rad2Deg;
         angle -= (float)facing;
         Quaternion q = Quaternion.AngleAxis(angle, Vector3.forward);
         transform.rotation = Quaternion.Slerp(transform.rotation, q, Time.deltaTime * theSpeed);
         
     }