Table 2: Photometric completeness f and the associated  uncertainty, both in percent, in the four regions in which we have divided our NGC 6218 field.

	Centre		Ring 1		Ring 2		Ring 3
V	f		f		f		f
18.25	91	2	94	1	95	2	96	1
18.75	86	3	93	2	94	2	96	1
19.25	79	6	92	4	93	2	95	1
19.75	76	5	90	2	91	1	94	1
20.25	75	4	86	4	89	1	92	1
20.75	67	7	82	2	86	2	90	1
21.25	59	9	77	2	83	2	88	2
21.75	47	6	70	2	80	2	84	2
22.25	34	5	62	5	74	2	80	2
22.75	22	4	48	4	63	2	72	1
23.25	13	4	31	3	49	3	59	2
23.75	6	3	18	3	33	2	42	2
24.25	2	1	7	3	19	4	23	2