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Photomicrographs showing the internal structure of the PMs (A3: GRSCa 150×, and A4: 1500×; B3: GRSAl 150×, and B4:1500×; C3: GRSCaAl 150×, and C4:1500×; D3: GPCa 150×, and D4:1500×; E3: GPAl 150×, and E4: 1500×; and F3: GPCaAl 150×, and F4: 1500×).
