Vector3.Angle, set range on individual axis

Hi,

I've followed the example on Unity's documentation about Vector3.Angle to see if a target is inside a certain specified angle from the player. So far so good, but I've would somehow like to set the size of the angles differently for the x and y axis, so the player e.g. detects broader in the x-axis, and narrower in the y-axis. Not really sure how to attack it. Here's the code as is now:

             Vector3 enemyDir = enemy.transform.position - transform.position;
             Vector3 frw = transform.forward;
             float angle = Vector3.Angle(enemyDir, frw);
             if(angle < 10.0f)
             {
                 print ("In range");
             }