FIG. 2.

Constant-$ħ\omega$ cuts of spin waves at selected energy-transfer values within the $(h,k)$ plane at 5 K. In all plots, data were subtracted by the empty-can background, integrated over the energy range of $ħ\omega \pm 0.5\text{meV}$ as well as integrating over $-5\le l\le 5$. The dashed lines are the BZ boundaries of the 2D reciprocal lattice. In (f), the $\text{Γ}$, $K$, and $M$ points are marked along the first BZ boundary for clarity.