Hi,Yanyan Wang I had met the problem as you ,maybe the version of sfs you use is too old to support the new version of chord, you can try sfs 0.8pre. Wu Yanjun ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡wuyanjun at mprc.pku.edu.cn ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2005-05-08