Residual spectrum and map after PSF subtraction show that the [O III] emission in our quasar is resolved. The left panel shows the residual spectrum analysis of a randomly selected pixel. The two vertical lines serve as markers highlighting the wavelengths of [O III]λ5007 and [O III]λ4949 emission lines for the centre of ID 608. The right panel showcases a residual map resulting from collapsing the residual spectrum of each pixel. The red square on the right panel corresponds to the specific pixel from which the residue spectrum was extracted in the left panel and the centre is marked by a white star.