Top: ALMA (left) and HiCIAO image (right) in polar projection. Middle left: deprojected ALMA image, with the analytic solution of a coplanar, planet-triggered spiral arm (black curve; ﹩{r}_{p}=90\,\mathrm{au}﹩, ﹩{\theta }_{p}=110^\circ ﹩, ﹩\epsilon =0.01﹩). The position of the putative planet is marked as a black dot. The dashed circles are included to guide the eye. Middle right: model with the spiral inclined by 17^◦ with respect to the disk plane. The part of the spiral located above the disk plane is indicated in black, while the more distant part is gray. Bottom: sketch of the viewing geometry in our inclined-spiral model (Section 4.3).