[O III]λλ4959,5007 doublet in a single spaxel spectrum of the continuum-subtracted cube of the Circinus galaxy. The disc (−100 km s⁻¹ <  v <  100 km s⁻¹) and outflow (−1000 km s⁻¹ <  v <  −150 km s⁻¹ and 150 km s⁻¹ <  v <  1000 km s⁻¹) components taken into account, highlighted in green with stripes and red, respectively, are superimposed to show an example of our procedure. The disc component is centred to the value of the stellar velocity in this spaxel (∼460 km s⁻¹), obtained previously by fitting the original data cube with pPXF. The magenta line represents the result of the three-component fit (blue, green, and red Gaussians), performed with MPFIT to reproduce the observed line profiles.