Dear Filippo and All friends, Merry Christmas and happy new year to you! All the best, Zhenghui Professor Zhenghui Xie Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029, China http://web.lasg.ac.cn/staff/xie/xie.htm e-mail: zxie at lasg.iap.ac.cn Tel.86-10-82995179(o) 13911012431(c) Fax.86-10-82995123(o)