The center of the character's capsule relative to the transform's position.

	// Move the center of the capsule up.
	var controller : CharacterController;
	controller = GetComponent(CharacterController);
	controller.center = Vector3 (0, 1, 0);

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    public CharacterController controller;
    void Example() {
        controller = GetComponent<CharacterController>();
        controller.center = new Vector3(0, 1, 0);
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	public controller as CharacterController

	def Example() as void:
		controller = GetComponent[of CharacterController]()
		controller.center = Vector3(0, 1, 0)