Visibility I / V
Article in the June issue of WGN magazine (by, E. Lyytinen, M. Nissinen, HJ Lehto) and that article (with permission) as a public link:
http://lyytinen.name/esko/lyytinen-holmes_offprint.pdf
The Finnish language is briefly explained in the forum:
http://foorumi.avaruus.fi/index.php?topic=11836.0
The image shows the 17th image minus the 19th image so the 19th day appears light lower and the 17th day dark higher.
Esko Lyytinen
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