              Used for PDB space group:\
\
               Example: 'C 1 2 1'  (instead of C 2)\
                        'P 1 2 1'  (instead of P 2)\
                        'P 1 21 1' (instead of P 21) \
                        'P 1 1 21' (instead of P 21 -unique C axis)\
                        'H 3'      (instead of R 3   -hexagonal)\
                        'H 3 2'    (instead of R 3 2 -hexagonal)\
 