Corrigendum: "Spectral rigidity of automorphic orbits in free groups"

Lemma 5.1 in our paper [5] says that every infinite normal subgroup of Out (F-N) contains a fully irreducible element; this lemma was substantively used in the proof of the main result, Theorem A in [5]. Our proof of Lemma 5.1 in [5] relied on a subgroup classification result of Handel and Mosher [8], originally stated in [8] for arbitrary subgroups H <= Out(F-N). It subsequently turned out (see Handel and Mosher [9, page 1]) that the proof of the Handel-Mosher theorem needs the assumption that H is finitely generated. Here we provide an alternative proof of Lemma 5.1 from [5], which uses the corrected version of the Handel-Mosher theorem and relies on the 0-acylindricity of the action of Out(F-N) on the free factor complex (due to Bestvina, Mann and Reynolds).