Fig. 3
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Similarity in radius 
against similarity in mass 
, as defined in Eq. (1). The color of the dots represent the mass of the host star. The black dashed line is the 1:1 line, and the red dashed lines corresponds to
= 3 
, which would be expected if density tends to be uniform. The green star corresponds to the Solar System and the blue one to the inner Solar System.
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