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Fig. 3


Lyman-α intensities as a function of time for the 0° latitude coupled lines of sight. Red points represent the forward-pointing (w.r.t. Earth/SOHO motion) line of sight and blue points represent the backward-pointing line of sight. The biannual crossing of the interstellar plane of symmetry where the forward and backward lines of sight point through equal-emitting gas volume is clearly visible.

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