Incompleteness test in J (red) and Ks (blue) for two regions: the very core of R 136 (r < 3″), shown with pluses and crosses, and outside of the core (r > 3″), shown with circles and triangles. For each flux value (magnitude) we used 500 artificial stars in order to find the completeness value. Note that artificial stars are added one by one to the original image, and there is always one artificial star in each experiment.