Different base pairs in helix regions can be indicated by user-definable symbols. This window allows you to change the mapping between base pairs and displayed symbols.
Pair definitions. Each line contains two textfields:
The right textfield contains one or more base-pairs. Each base pair contains two characters (bases, gaps-characters, ...). Base-pairs are separated by spaces (' ').
The left textfield contains the helix symbol used for each of the specified pairs.