Table 3: Main characteristics of the three instrumental setups used for our survey.
Filter $\lambda_{\rm c}$ FWHM Camera Field of view

( $\mu$ m) ( $\mu$ m) (arcsec $\times$ arcsec)

NB_1.26 1.257 0.014 S13 13 $\times$ 13

NB_1.64 1.644 0.018 S13 13 $\times$ 13

NB_2.17 2.166 0.023 S27 27 $\times$ 27

**Table 3:** Main characteristics of the three instrumental setups used for our survey.
Filter	$\lambda_{\rm c}$	FWHM	Camera	Field of view
	( $\mu$ m)	( $\mu$ m)		(arcsec $\times$ arcsec)
NB_1.26	1.257	0.014	S13	13 $\times$ 13
NB_1.64	1.644	0.018	S13	13 $\times$ 13
NB_2.17	2.166	0.023	S27	27 $\times$ 27

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