Fig. 1

Map of Germany with 47 intervention districts (black) in the federal states Baden-Württemberg (orange), Bavaria (blue), Hesse (green), Lower Saxony (pink), and Rhineland-Palatinate (purple). The template of the map was derived from the public domain of Wikimedia Commons and modified by the authors from the file (https://commons.wikimedia.org/wiki/File:Landkreise,_Kreise_und_kreisfreie_St%C3%A4dte_in_Deutschland_2011-09-04.svg), which has been made freely available by Wikimedia User TUBS (2011)