(color online) In-plane azimuthal-angle dependence at 1.572 ± 0.001 K for K₂Cr₃As₃. (a) The derivatives of for different ϕ angles, from which is obtained. (b) Polar plot of the extracted . The red (blue) triangles come from the rotation of the derived data with (−120°), respectively. Shown at the upper right is the photograph of the sample configuration in the measurement. The lower-right corner shows the possible Cr₆-octahedron spin order for the magnetic ground state, according to first-principles calculations (adapted from Ref. [53]).