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Fig. 4

image

Surface coverage from the three observations. The grayscale informs on the occurence of observation (surface always observed at sub-earth time if in black, never observed if in white) as a function of the rotational phase, according to each possible rotational period (4.31, 5.28, 6.63 and 9.15 h, from bottom to the top). For each rotational period, horizontal lines represent the coverage by night (nightly coverages appear chronologically from bottom to the top). See text for more explanation.

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