Fig. 10.
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Open clusters Cr 135 and UBC 7 in the tangential plane contacting the celestial sphere at the common centre of the mass of the clusters. The red dots show probable members of Cr 135, and blue dots show probable members of UBC 7. The circles show the core and tidal radii. Black dots show the centres of the clusters. The “+” sign shows the centre of mass, which is assumed to be at 292 pc from the Sun. Linear coordinates ξ and η are parallel to equatorial ones.
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