Two types of distribution of the gas velocity dispersion of MaNGA galaxies dispersion σm in galaxies with B distribution is higher by around 5 km
s-1, on average, than that of galaxies
New calibrations for abundance determinations in HII regions strong emission lines R2, R3, and N2 (R calibration) or
S2, R3, and N2 (
S calibration) in their spectra