Fig. 2From: Quantifying spatial accessibility of general practitioners by applying a modified huff three-step floating catchment area (MH3SFCA) methodThe second step of the MH3SFCA method. The supply–demand-ratio \(R_{j}\) is calculated by dividing the capacity of \(j\) by the sum of the products of the \(Huff_{ij}\) values and the number of inhabitants for each reachable demand location \(i_{1}\), \(i_{2}\) and \(i_{3}\)Back to article page