**Table 2:** Telescopes and instrumentation.
Site	NAO Rozhen	AO Belogradchik
Telescope	2-m Ritchy-Chrétien	60-cm Cassegrain
CCD type	Photometrics AT200	ST8
Chip	Site SI003AB UV-AR	KAF 1600
Chip size	$1024\times1024$ pixels	$765\times510$ pixels¹
Pixel size	$24\times24$ $\mu$ m	$18\times18$ $\mu$ m¹
Scale	0.31 $^{\prime\prime}$ /pixel	0.49 $^{\prime\prime}$ /pixel¹
Field	$5.3\hbox{$^\prime$ }\times5.3\hbox{$^\prime$ }$	$6.2\hbox{$^\prime$ }\times4.2\hbox{$^\prime$ }$
Gain	4.93 e^-/ADU	2.3 e^-/ADU
RON	1.03 ADU/rms	10 ADU/rms

¹ With a binning factor of $2\times2$ .

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