Aleksander Medvedev, Vladimir Onishchuk, Sergey Savrasov,
Artem Resnynskiy and Evgenia Kuznetsova - for DiamCalc software
modifications that made this work possible and for help during
preparation of this paper.
Maxim Viktorov for spectra recording.
Roman Serov for discussions and optimization work.
Ksenia Gorbenko and Petr Pisarev for preparation of illustrations.
Garry Holloway for useful suggestions and text edition.
Our wives and children for their patience.