Fig. 1.
Overlap between the groups of oEA stars (71 members, denoted by dots), detached binaries with a δ Scuti component (58 members, denoted by triangles), and R CMa systems. Squares and diamonds represent the systems that belong to two different groups and the cross symbol the system OGLEGC 228, which is the only R CMa system that does not exhibit pulsations. The red star denotes KIC 8553788.
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