Fig. 5
Colour–magnitude diagram using Hipparcos data (Perryman & ESA 1997). The green point indicates the position of a quiescent U Sco, and the red point the location of a quiescent RS Oph (left) and T CrB (right). The blue point shows the position of a quiescent KT Eri. Although the position of U Sco appears coincident with the upper main sequence, the system contains a sub-giant secondary.
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