Fig. 3
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Co-added R-band images of 64P on January 1 (upper left), January 3 (upper right), January 4 (bottom left), and January 11 (bottom right), 2019. The Y-axes are realigned to the northern direction, and east is to the left. The field of view is approximately 1′ × 1′ for each image. The yellow arrow represents the Sun’s direction, while the blue arrow represents the velocity direction of the comet.
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