Star counts and membership probabilities in the core and tails of cluster Collinder 350 if simulated with different positions of the cluster. Top: Mean membership probability of stars that have membership probability P > 0.6 in our original calculation after recomputing them with different cluster models. Shades show 16th and 84th percentiles and the silid lines show the 50th percentile. Bottom: Number of stars with P > 0.6 in the core (blue) and tails (orange) is shown with solid lines for the original cluster model and five different deviations from the model. Dashed lines show the number of stars that do not appear in the selection made with the original cluster model. All models deviated from the original in the position of the cluster centre in galactic latitude.