Due to an error by the publisher, the wrong doi code was inserted in the header of the paper. Editorial Committee apologizes the authors for the trouble caused by the error.
（誤）The doi code in the header of the paper at odd pages: doi:10.2151/sola.2005-005, Accepted date: accepted 28 December 2005
（正）The doi code in the header of the paper at odd pages: doi:10.2151/sola.2005-007, Accepted date: accepted 28 December 2004
