Table 2.

Energy-dispersive X-ray spectroscopy (EDX) on points in Figure 3.

Image	MTA-P				MTA-A
Point	%
Element	1	2	3	4	1	2	3	4
Bi	77.5	–	80.8	–	86.2	90.2	–	87.2
O	10.0	27.6	7.9	43.3	2.8	2.5	33.5	5.2
Ca	7.2	17.2	7.1	13.3	6.1	6.2	10.4	6.3
Ca	4.2	39.2	3.4	25.4	1.3	1.1	35.6	6.3
Si	1.1	9.8	0.9	7.5	–	–	11.2	–

^aThe presence of carbon is likely from the carbon tape adhesive.