Table 1: DOT filter specification.
designation $\lambda$ (Å) width (Å) type tuning

blue continuum 4320 6 interference fixed

red continuum 6540 3 interference tiltable

G band 4305 10 interference fixed

Ca IIH 3968 1.35 interference tiltable

H $\alpha$ 6563 0.25 Lyot tunable

Ba II 4554 0.08 Lyot tunable

**Table 1:** DOT filter specification.
designation	$\lambda$ (Å)	width (Å)	type	tuning
blue continuum	4320	6	interference	fixed
red continuum	6540	3	interference	tiltable
G band	4305	10	interference	fixed
Ca IIH	3968	1.35	interference	tiltable
H $\alpha$	6563	0.25	Lyot	tunable
Ba II	4554	0.08	Lyot	tunable

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