Relations between the radius and other parameters of the circumnuclear region of the AGN-type. Panels a, b, and e: radius of the zone of dominant contribution of the AGN to the radiation, R_AGN, as a function of the luminosity of this zone in the Hα emission line (panel a), in the [O III]λλ4959,5007 emission lines (panel b), and as a function of the central gas velocity dispersion (panel e). Panel c, d, and f: same as panels a, b, e (respectively) but for the radius of the zone of the AGN influence on the radiation, R_INT. The points in each panel denote individual galaxies. The line is the best linear fit to those data (see Table 3).