Cross-cuts in the images of the nebula in three filters; F169M (blue), F172M (green), and N219M (red) made along the white lines shown in the slightly smoothed F169M image of the nebula (top). Cross-cuts of 8 pixel widths were obtained in all the images at the same locations (coordinates). The bottom cross-cut, which passes through the nebular core, is on a logarithmic scale and has been smoothed. We note the faint quasi-circular extended halo around the core of the nebula (on the south-east side). This region has been shown with a grey overlay in the plots. Despite having similar core fluxes in all three filters, only F169M shows the presence of the halo.