Author comment for 1999BaltA...8..535M:

Lectures given at the Nordic-Baltic Research Course in Applied Astrophysical Photometry, held September 1999 at the Moletai Observatory, Lithuania.

The paper is available as electronic preprint astro-ph/0004049. A version with all figures in high resolution is available from the authors' home institutions at the following URLs:

Author comment submitted 20-Jun-2000 by Bo Milvang-Jensen (