Polar-coordinate visualisation of the disk of HD 34700 A, from IRDIS Q_ϕ frame, multiplied for a r² correction factor for the flux dilution and lightly smoothed. Note: the disk is duplicated horizontally to avoid cuts at the image boundaries (notice the x axis). The colour scale is logarithmic to highlight the faint spiral arms. In dashes, the fitted logarithmic (lime green) and archimedean (blue) spiral arms. The cyan circle around 310° represents the approximate centre of the mm-dust emission.