The same collaborations as the conceptual graph, placed where the work was actually produced. Each marker is a city, sized by how many papers were co-authored with someone based there. Zoom in and cities with several institutions split into per-institution markers (e.g. Barcelona → ICFO, ICREA, UAB, UPC, shown in orange). Lines radiate from Leiden (home, in red). Because this is built from the affiliations printed on each paper, a collaborator who has moved naturally appears in more than one place. Hover for the people; scroll to zoom, drag to pan.
fewer papers more papers institution (zoomed in) Leiden (home) 85 places