It is pointed out that a recently introduced definition of the degree of coherence of a random electromagnetic field is not a true quantitative measure of coherence.
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ErrataTero Setälä, Jani Tervo, and Ari T. Friberg, "Reply to comment on “Complete electromagnetic coherence in the space–frequency domain”: erratum," Opt. Lett. 29, 2438-2438 (2004)