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Fig. 2

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a) Upper limit of magnetospheric sizes and b) the corresponding apertures of their auroral ovals for hypothetical planets orbiting the dM stars in our sample. We assume that these planets harbour dipolar magnetic fields with the same intensity as that of the Earth. For comparison, the dashed line shows the present-day Earth’s magnetospheric size (upper panel) and the Earth’s auroral oval aperture (lower panel).

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