spec·tro·graph·i·cal·ly /-ɪk(ə)lɪ/ 副詞
Spec·tro·graph n. Physics (a) An apparatus for photographing or mapping a spectrum. (b) A photograph or picture of a spectrum. -- Spec*tro*graph*ic a. -- Spec*tro*graph*ic*al*ly adv. -- Spec*trog*ra*phy n.
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spectrographically
adv : by spectrographic means; "the speech spectrum was displayed
spectrographically"