Fig. 2

Visualisation of out-of-hospital cardiac arrest incidence in Amsterdam. Spatial kernel density estimation of out-of-hospital cardiac arrest incidence in Amsterdam. The contour lines indicate high incidence areas, defined as the smallest total area that encompasses 20% of the total probability density. (Municipal boundaries: © Kadaster / Central Bureau for Statistics, 2018, CC BY-SA. Background: © OpenStreetMap contributors, CC BY-SA.)