Supplement 1: Length of the Pontus coastline according to the Ξ and Ω recensions of Ptolemy's Geography and a corrected version of the Ξ recension

Supplement 1 to the paper "<strong>The Configuration of the Pontus</strong><strong> Euxinus in Ptolemy’s <em>Geography</em></strong>" submitted to the History of Geo- and Space Sciences (URL: https://www.history-of-geo-and-space-sciences.net). The paper is a part of the research project “Development of the Methods for Analysis of the Historical Maps” supported by the Russian Foundation for Basic Research (grant 18-011-00258-a). <em>Correspondence</em>: Dmitry A. Shcheglov ([e-mail])