Comparison of multi-epoch spectra for models r0e1 and r0e4, which are identical to model r0e2 except for the lower and higher ejecta kinetic energy. Model r0e2 is discussed in Sect. 3. Its spectral properties are intermediate (e.g., in SED color, line widths, or ionization) between those of models r0e1 and r0e4.
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