Table 4: Summary of identifications and classifications.
Source type Selection criteria identified classified

fg Star ${\rm log}({{f}_{\rm x} \over {f}_{\rm opt}}) < -1.0$ and HR2 - EHR2 < 0.3 and HR3 - EHR3 < -0.4 or not defined 6 90

AGN Radio source and not classification as SNR from HR2 or optical/radio 1 36

Gal optical id with galaxy 1

GCl X-ray extent and/or spectrum 1 1

SSS HR1 < 0.0, HR2 - EHR2 < -0.99 or HR2 not defined, HR3, HR4 not defined 18

SNR HR1 > -0.1 and HR2 <-0.2 and not a fg Star, or id with optical/radio SNR 21 23

GlC optical id 27 10

XRB optical id or X-ray variability 7 9

hard HR2 - EHR2 > -0.2 or only HR3 and/or HR4 defined, and no other classification 567

**Table 4:** Summary of identifications and classifications.
Source type	Selection criteria	identified	classified
fg Star	${\rm log}({{f}_{\rm x} \over {f}_{\rm opt}}) < -1.0$ and HR2 - EHR2 < 0.3 and HR3 - EHR3 < -0.4 or not defined	6	90
AGN	Radio source and not classification as SNR from HR2 or optical/radio	1	36
Gal	optical id with galaxy	1
GCl	X-ray extent and/or spectrum	1	1
SSS	HR1 < 0.0, HR2 - EHR2 < -0.99 or HR2 not defined, HR3, HR4 not defined		18
SNR	HR1 > -0.1 and HR2 <-0.2 and not a fg Star, or id with optical/radio SNR	21	23
GlC	optical id	27	10
XRB	optical id or X-ray variability	7	9
hard	HR2 - EHR2 > -0.2 or only HR3 and/or HR4 defined, and no other classification		567

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations and data analysis
	3 Source catalogue
	4 Images
	5 Cross-correlation with other M 31 X-ray catalogues
	6 Classes of point-like X-ray sources detected in the direction of M 31
	7 Summary
	References