Table 11: Cross-check of membership derived for NGC 2451 A by Platais et al. (2001) and by our X-ray investigation.
Sample in field of PSPC HRI

in field-of-view: 54 14

membership probability >50%: 35 10

B/A-type stars: 10 4

$\rightarrow$ late-type stars: 25 6

non-members by our photometry: 3 0

$\rightarrow$ comparison sample: 22 6

detected in X-rays: 13 5

percentage: 59% 83%

**Table 11:** Cross-check of membership derived for NGC 2451 A by Platais et al. (2001) and by our X-ray investigation.
Sample in field of	PSPC	HRI
in field-of-view:	54	14
membership probability >50%:	35	10
B/A-type stars:	10	4
$\rightarrow$ late-type stars:	25	6
non-members by our photometry:	3	0
$\rightarrow$ comparison sample:	22	6
detected in X-rays:	13	5
percentage:	59%	83%

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