Table 5. The sum of average iron and sulfur and the others inorganic matter by outside and inside with shipwrecks (XRF; %)

Variable	Shinan		Yeongheungdo	Jindo	Sibidongpado	Wando
	Degradation	Lightly degradation
Outside
Fe	74.58	51.89	71.83	82.55	12.73	25.55
S	21.66	30.05	12.77	10.19	32.38	35.68
Others	5.34	20.83	16.72	8.00	54.88	40.39
Fe + S	96.24	81.94	84.60	92.74	45.12	61.22
Inside
Fe	70.64	61.84	67.04	65.04	10.20	17.26
S	26.09	33.11	31.51	26.33	35.73	18.63
Others	3.89	5.05	2.91	8.92	54.07	70.14
Fe + S	96.74	94.95	98.55	91.36	45.93	35.89

XRF: X-ray fluorescence spectrometry.