This map extracts Georgian areas (including dashed) from the linguistic map of Alazani-Avtoran valley by Yuri Koryakov. (Коряков Ю. Б. Атлас кавказских языков / РАН. Ин-т языкознания. — Москва: Пилигрим, 2006. — 76 с.: карты.)
see the base map here: 
[1]

[2]
Own work
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