“…[12,Theorem 1.11]). Here in Lemma 3.1 we do not assume that Supp C is smooth as in [12,Theorem 1.11], so these 2 results do not contain each other. Also it appears to us that the assumptions in Lemma 3.1 are quite simple, so the statement might be known to experts, but we could not find any similar statement in the literature (cf.…”