(a) Evolution of the band structure of a 2D noncentrosymmetric system with I_ST symmetry as a tuning parameter m increases. (b) Trajectories of 2D Weyl points in the intermediate semimetal phase as m increases. ⊙ and ⊗ are the locations where pair creation and pair annihilation happen. Figures are adopted from the supplemental materials in Ref. [6].