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Fig. 1.

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Visualisation of the 5200 Å region (red bar) for non-CP star HD 220575 (top), and of confirmed mCP star HD 212714 (bottom). Both stars have a similar spectral type (B8) and their spectra were both taken with the ESPaDOnS instrument. The characteristic Si II lines at 5041 and 5055 Å are also indicated (red tick marks).
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