Table C.2: Target / field content classification.
Class Description Percentage

p point or point-like source 50%

s small extended ( $r < 3\hbox{$^\prime$ }$ ) 10%

l large extended ( $r > 3\hbox{$^\prime$ }$ ) 22%

e extended source of unknown extent 0.7%

f ``field'' (all detections are potential targets) 12%

x ``X-ray shadow experiment'' and similar, that is, only the spectra of fore- and background objects are of interest (though the location of the field should be considered as ``target'') 2.5%

t two clearly identified targets (e.g., a double star) 0.4%

n there is no target associated with the field 0.2%

u unknown target, i.e., the target could not be classified or is of unknown nature 2%

**Table C.2:** Target / field content classification.
Class	Description	Percentage
p	point or point-like source	50%
s	small extended ( $r < 3\hbox{$^\prime$ }$ )	10%
l	large extended ( $r > 3\hbox{$^\prime$ }$ )	22%
e	extended source of unknown extent	0.7%
f	``field'' (all detections are potential targets)	12%
x	``X-ray shadow experiment'' and similar, that is, only the spectra of fore- and background objects are of interest (though the location of the field should be considered as ``target'')	2.5%
t	two clearly identified targets (e.g., a double star)	0.4%
n	there is no target associated with the field	0.2%
u	unknown target, i.e., the target could not be classified or is of unknown nature	2%

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