The aim of this map is to show the number of STN correspondents in each place named in the database. More than a simple map of sales because it takes into account correspondents, this map displays the European extent of the commercial network of the STN. NB. In the database and this visualisation, 'Correspondents' or 'Corresponding clients' refers to clients who sent (surviving) letters to the STN. There are in addition some 'clients' recorded in the database who were either sent letters by the STN, or who traded with the STN but for whom no correspondence survives. This visualisation refers only to 'Correspondents'.