tokens: SPCP is grateful to the Space Telescope Science Institute, Baltimore, USA, the Research School for Astronomy and Astrophysics, Australian National University, Canberra, Australia, and the Instituto de Astrofisica de Canarias, La Laguna, Tenerife, Spain, for hospitality and support during short and extended working visits in the course of his PhD thesis research. He thanks Roelof de Jong and Ron Allen for help and support during an earlier period as a visiting student at Johns Hopkins University and the Physics and Astronomy Department, Krieger School of Arts and Sciences for this appointment. PCK thanks the directors of these same institutions and his local hosts Ron Allen, Ken Freeman and Johan Knapen for hospitality and support during many work visits over the years, most of which were directly or indirectly related to the research presented in this series of papers. Work visits by SPCP and PCK were supported by an annual grant from the Faculty of Mathematics and Natural Sciences of the University of Groningen to PCK, accompanying his distinguished Jacobus C. Kapteyn professorship, and by the Leids Kerkhoven-Bosscha Fonds. PCK's work visits were also supported by an annual grant from the Area of Exact Sciences of the Netherlands Organization for Scientific Research (NWO), in compensation for his membership of its board.
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