Key points are not available for this paper at this time.
A catalogue of HII regions in NGC 7331 is presented, with positions relative to the center of the Galaxy and relative Hα fluxes. The catalogue can be found as an electronic file at the CDS related to the companion paper "Catalogue of HII region measured on 6 meter telescope plates at Observatoire de Marseille".
H. Petit (Sat,) studied this question.