Narrow-band images of the central region with a size of 10′′× 10′′ (filters given on the top left of each map). A PSF pattern has been subtracted. The colour scale for the fluxes ranges from 0 to 10⁻¹⁵ erg cm⁻² s⁻¹ Å⁻¹. The adopted axis of the jet (green lines with arrows) was aligned according to a helical structure visible extended in NE direction on the [OIII]λ5007 emission map; this structure probably represents a high-collimated jet. The jet base position (green circle) drawn from the adopted jet axis does not coincide with the position of the stellar components resolved in Schmid et al. (2017).