Comparison between MUSE and GO98 Hα images. The top panel shows the MUSE background subtracted image (black-grey) with the GO98 image overimposed in green contours. Within the GO98 image, we identified several knots of material, marked with dark green contours, for which we tentatively identified their counterparts in the MUSE image (joined through dashed lines). The different colours indicate if the knots belong to the NE or SW filaments, or to the equatorial ring. The white dotted dashed line indicates the rectangular section used to determine the extension of the equatorial ring. The bottom panel shows the ratio of expansion velocities between the MUSE and GO98 images versus the difference in position angle between MUSE and GO98 images for each knot identified in the top panel. The different markers indicate whether the knot belongs to the equatorial ring or a filament, while the colours show the expansion velocity measured from the MUSE image. Overall, the knots are consistent with a radial, free-expanding shell.