In this short note we prove an estimate on the rank a.e. of the tangent (p,p)
vector to a a positive closed current of bidimension (p,p) in CP^k, in terms of
the dimension of its trace measure.Comment: This is a complement, not intended for publication, to my paper
"Fatou directions along the Julia set for endomorphisms of CP^k"
[arXiv:1006.0882