The anchor of the text.

	guiText.anchor = TextAnchor.MiddleCenter;

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Example() {
        guiText.anchor = TextAnchor.MiddleCenter;
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Example() as void:
		guiText.anchor = TextAnchor.MiddleCenter