Measuring the size of Mrk 1044’s spatially extended Hβ outflow. Panel (a) shows the flux map of the Hβ outflowing component which we extracted as described in Paper I. Panel (b) shows the best-fitting model that consists of the empirical PSF convolved with a Gaussian kernel and a constant background flux. The residuals in panel (c) show that broadened PSF describes the Hβ profile well. Panel (d) shows the χ² distribution in the parameter plane where a global minimum is present around 0.55 px (4.6 pc).