There is an imprecision in the conclusion of the entry: the effective RoC corresponding to a smaller Gouy phase is few meters SHORTER and not longer.

However, it should be noticed that the RoC LMA measurements average the radius of curvature over a region 150mm diameter, while the TEM00 and following 4 HOMs "see" a slightly smaller region of the mirror. In any case, more investigations will be performed.