1. Contribution from RIKEN (The Institute of Physical and Chemical Research), Wako-shi, Saitama 351-0198, Japan, PRESTO (Japan Science and Technology Corporation), Kawaguchi, Saitama 332-0012, Japan, Graduate School of Human Informatics, Nagoya University, Chikusa, Nagoya 464-8601, Japan, and Faculty of Science, Rikkyo University, Toshima, Tokyo 171-8501, Japan