Left: blind size θ₅₀₀ of the Planck clusters extracted from the public Planck data as a function of the blind size θ₅₀₀ Planck published by the Planck collaboration (Planck Collaboration XXVII 2016a). Red dots are individual clusters. There is overall agreement, but some clusters show deviations larger than a factor of two. They are marked with a red cross. The dotted black line delineates the deviation by a factor of two. Right: ratio of the two size values as a function of the S/N published by the Planck collaboration. The deviating clusters are mainly located at the lower S/N, for which the blind size estimation is uncertain.