Mass-radius diagram for the known exoplanets with the lowest masses with measured mass precisions better than30% (gray symbols). The new locations of the LHS 1140 planets are shown as filled blue (LHS 1140 b) and orange (LHS 1140 c) circles. Their previous locations using the values from Ment et al. (2019) are shown as open squares with dashed error bars and the same color code. The candidate planet at an orbital period of ~ 78 days is shown as the shaded magenta region. Its radius is not known, therefore its vertical location comes from the simple mass-radiusrelations from Chen & Kipping (2017). The bulk density lines corresponding to different compositions from Zeng et al. (2019) are shown as solid traces, and the dashed lines correspond to iso-densities of 1.33, 5.3, and 10 g cm−3 (from top tobottom).
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