Different colour images using Y,HeI, and J bands (blue, green, and purple parts of Fig. 6). The photocentres of the Y (black cross) and J bands (blue cross) are represented as well as the best fit of the spiral, shown by a grey dashed line. The dashed green circles both represent regions from which the two spectra have been extracted in Fig. 6: from the star (inner region) and the pinwheel (between the two circles).