particle system size multiplier

using UnityEngine;
using System.Collections;

public class ParticleSystemMultiplier : MonoBehaviour {

    // a simple script to scale the size, speed and lifetime of a particle system

    public float multiplier = 1;

    void Start()
    {
        var systems = GetComponentsInChildren<ParticleSystem>();
        foreach (ParticleSystem system in systems) {
            system.startSize *= multiplier;
            system.startSpeed *= multiplier;
            system.startLifetime *= Mathf.Lerp (multiplier,1,0.5f);
            system.Clear();
            system.Play();
        }
    }
}