  The preliminary material of the monograph (arXiv:1607.03852) written by the
first two authors contains two major imprecisions that necessitates a number of
(in the end harmless) changes throughout the entire text. One is about
identification of abstract and concrete Hardy spaces for perturbed Dirac
operators, the other one about interpolation of quasi-Banach function spaces.
Since these erroneous statements are not unlikely to spread, we provide a
detailed corrigendum, including further background and corrected statements for
all affected results. All other results remain unchanged.
