SITELLE velocity map in the region shown in Fig. 1, overlaid on the net Hα image in the grey scale. The big green ellipse in the dashed line shows the D25 aperture of NGC 4569, while the small green ellipse in the dotted line is 1/3 of the size of the big green ellipse. NGC 4569’s nucleus is marked by a green cross. One can observe the disk rotation close to the nucleus and the truncated Hα disk (e.g., Boselli et al. 2016). The red ellipse in the dashed line shows the D25 aperture of IC 3583 with a velocity of 1121 km s⁻¹. Its interaction with NGC 4569 was excluded by Boselli et al. (2016).