The theory of the degree of paraxiality is correct. Very likely, the Comment [Opt. Lett. 33, 3004 (2008) ] on our original Letter [Opt. Lett. 33, 1360 (2008) ] originated from an imprecision we made in the plot included in the paper. Such imprecision induced the Comment’s author to raise further objections that, as proved in the present Reply, are totally incorrect.
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