WHAT DOES YB:GLASS & ER MEAN?

 4a,b. And it might be proved via the orientation marriage by PF mapping, as proven in Fig. 4c,d, examining it by which the shut-packed aircraft two hundred of diopside and the near-packed plane 111 of spinel obtained. Aside from, the various orientation relationship with PF mapping could be expressed with the several factors overlapped, for inst