This function allows the users to select among the present single maps and fix them on synoptic combination maps according to their own interests. So, the spreading areas of any linguistic and extralinguistic feature can be visualised in connection with each other. At the same time, there is the possibility to fix these synoptic maps in zoom levels when a local context shall be demonstrated, as e.g. the [Karwendel|Karte:Karwendel]] or the dialectal continuum between Occitan, Franco-Provençal and Piedmontese in the  <a target="_BLANK" href="?db=161&amp;tk=29">Western Alps</a>.