Table 1: Narrow band filter characteristics and interferometric coupler splitting ratios as measured in laboratory calibrations.
Filter $\lambda_{{\rm c}}$ FWHM R T

( $\mu$ m) ( $\mu$ m)

K203 2.03 0.10 0.67 0.33

K215 2.15 0.10 0.53 0.47

K222 2.22 0.10 0.56 0.44

K239 2.39 0.10 0.78 0.22

**Table 1:** Narrow band filter characteristics and interferometric coupler splitting ratios as measured in laboratory calibrations.
Filter	$\lambda_{{\rm c}}$	FWHM	R	T
	( $\mu$ m)	( $\mu$ m)
K203	2.03	0.10	0.67	0.33
K215	2.15	0.10	0.53	0.47
K222	2.22	0.10	0.56	0.44
K239	2.39	0.10	0.78	0.22

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