Bandpass image of 10x10 arcsecs² centred at the position of V1425 Aql and showing the extension of the nova shell. The grey image corresponds to an i_SDSS image, and the contours show the extension of the inner and outer shell as seen at the Ha (red) and [OIII] λ 5007 A (blue) wavelengths, respectively, with thicker lines denoting regions with higher emissivity. Both the image and the contours were obtained from the MUSE datacube. The difference in spatial extension between the two shells is evident, as is the asymmetry observed in the outer shell.