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n OTCHフィルター（ BEF 、バンド阻害）は、ほとんどの波長を透過することができますが、特定の波長範囲（ BEF ）で光を非常に低いレベルに減衰させます。 n otchフィルターは、バンド-パスフィルターとは対照的に、より狭い波長範囲の光のみを阻害します。
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