Table 9: Number of nights and hours which have been devoted to the study of NGC 6791 as a function of the diameter of the telescope used for the survey. We adopted a mean of 5 hours of observations per night.
Telescope Diameter(m) $N_{\rm nights}$ Hours Ref.

FLWO 1.2 84 $\sim$ 300 M05

Loiano 1.5 4 20 This paper

SPM 2.2 8 48 This paper

NOT 2.54 7 35 B03 and this paper

CFHT 3.6 8 48 This paper

MMT 6.5 3 15 Hartmann et al. (2005)

**Table 9:** Number of nights and hours which have been devoted to the study of NGC 6791 as a function of the diameter of the telescope used for the survey. We adopted a mean of 5 hours of observations per night.
Telescope	Diameter(m)	$N_{\rm nights}$	Hours	Ref.
FLWO	1.2	84	$\sim$ 300	M05
Loiano	1.5	4	20	This paper
SPM	2.2	8	48	This paper
NOT	2.54	7	35	B03 and this paper
CFHT	3.6	8	48	This paper
MMT	6.5	3	15	Hartmann et al. (2005)

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