Comparison of parameters related to bar strength (vertical axis) in relation to activity plotting parameters (horizontal axis). In the vertical axis, ϵ is the ellipticity of the bar and c is the boxiness parameter, both measured in i-band of the SDSS. The horizontal axis shows the [O III]λ5007 luminosity, [O III]λ5007 luminosity normalised by the fibre luminosity, obtained for an aperture of 3″, and ℛ.