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UNL

Spectrogram of Iota Pagasi. The stellar spectrum shows many lines, including those of iron: these can generally be recognized with confidence, especially pairs of them, as at 4251 and 4273. They are all seen displaced towards the violet, or region of shorter wavelength, implying approach. If V = the velocity of light v = velocity of the star L = the normal wavelength L¹ = the modified length Then, v : V :: L¹ --L : L

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