One-component fit for the galaxy ESO 209-G009. The horizontal axis is the offset in arc-seconds from the galactic plane in z direction, and the vertical axis the average flux density in μJy beam⁻¹. The data are shown with dots and the Gaussian fitted function with dashed line. The shaded gray area extends from −3 rms to 3 rms, and the solid line within this area is the residual of the fit. The “wings” of emission above the fit at both sides of the profile together with the residuals being greater than 3 rms suggest that a second component is needed to accurately fit the data.