我已经按照membrane proteins tutorial做出了KCSA.pdb文件，但是在实行tcl语句：foreach S{A B C D}{set seg [atomselect top "segname $S and chain C"]$seg writepdb seg$S.pdb $seg delete的时候，却出现了：can't read "S": no such variable
现在却出现了这个问题：
(VMD) 1 % foreach S { A B C D } { set seg [atomselect top "segname $S and chain C"] $seg writepdb seg$S.pdb $seg delete }
can't read "seg": no such variable
>Main< (VMD) 2 %
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