I found an easier way to make missing bonds between some atoms. One someone run "source aim.vmd" and then "source igm_inter.vmd" and saw some missing bonds it is easier to remove the "bond paths" between atoms from graphics menu and then make the missing bond and then again activate the "bond paths".
Regards,
Reza
After choosing "add/remove bond", you must click exactly centers of two atoms, so that the atoms can be selected.
Best,
Tian
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