Spot configuration of pairs of observations obtained at a few hours of distance. Each map shows the results obtained by the chain. At each step, the chain generates a map for each triplet of values (latitude, longitude, and radius), drawing the corresponding spot on the stellar surface. The final map, as well as those shown in this figure, is obtained by summing the individual maps obtained at each step of the chain using a colour scale ranging from red to blue. The bluest area on the map represents the final configuration of each spot determined by the chain.