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Fig. 4

image

Montage of selected visual-wavelength spectra of SN 2007on (left) and SN 2011iv (right). The spectra are colour coded with respect to the facility used to obtain the observations. Previously unpublished NTT (+EMMI) spectra of SN 2007on are highlighted as thick purple lines. All spectra are listed in Tables F.6 and F.7.

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