Table 1: Number of candidate members of NGC 6530 for each selection method. Panel 1a: stars in the ACIS field; diagonal terms are the total numbers of stars for each method, while off-diagonal terms are those found by two methods simultaneously. Panel 1b: the same representation for the entire WFI field, including the ACIS field (X-ray sources are not reported as there is no additional X-ray information outside the ACIS field). Panels 2a and b: members found exclusively by one method, in the ACIS and WFI fields. Panels 3a and b: members found by any of the Q indices, regardless of X-ray detection, including X-ray sources and excluding them, respectively, in the ACIS and WFI fields.
Breakdown of NGC 6530 members
1a: Common subsets by different methods - ACIS field
  QJHHK QVIJK QVIIJ QBVJK X-ray
QJHHK 18 12 5 11 12
QVIJK   124 30 108 53
QVIIJ     53 25 8
QBVJK       151 66
X-ray         884
1b: Common subsets by different methods - WFI field
  QJHHK QVIJK QVIIJ QBVJK  
QJHHK 33 17 6 14  
QVIJK   200 50 163  
QVIIJ     102 39  
QBVJK       230  
2a: Subsets found by only one method - ACIS field
  QJHHK QVIJK QVIIJ QBVJK X-ray
  3 8 20 26 807
2b: Subsets found by only one method - WFI field
  QJHHK QVIJK QVIIJ QBVJK  
  13 20 47 48  
3a: Subsets found by many methods - ACIS field
any Q any Q or X-rays any Q and no X-rays
196 1020 120
3b: Subsets found by many methods - WFI field
any Q any Q or X-rays any Q and no X-rays
333 1157 257


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