[Wien] the difference between wien97 and wien 2k

[Yushan Wang]

Dear users,
when caculate the optical properties, the wien97 says:
..., /x opticc -so [-up] /x joint -so [-up] /x kram -so [-up], but wien2k
says:/ x opticc -so [-up] / x joint [-up] / x kram [-up]/,
question: there are no" -so" in calculating "joint' and "kram" in wien2k.
why?

yushan