Emission-line analysis for the central regions of FCC 312. Top panels: maps of the total flux, mean velocity and velocity dispersion along the line-of-sight from the [N II]λ6583 nebular emission. Middle panels: maps of the [N II]λ6583/Hα and [O III]λ5007/Hβ line ratios and corresponding BPT diagram. Bottom panels: maps of the de-reddened Hα flux, extinction on the nebular lines, and extinction derived from the stellar continuum. Velocities and velocity dispersions are in km s⁻¹, reddening values are in magnitude, line ratios and fluxes are shown in a logarithmic scales, with the latter in units of 10⁻²⁰ erg cm⁻² s⁻¹. Grey areas in the maps refer to regions where the S/N of the relevant lines was not sufficiently elevated to firmly exclude a false positive detection. These levels were established in regions devoid of emission well above and below the equatorial plane of the galaxy.