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Context. The radius valley is the bimodal distribution of planet radii Rp = 1 − 3.9R⊕, which separates super-Earths from sub-Neptunes. One possible explanation is that stellar clustering in the birth environment of the host star could cause sub-Neptunes to shed their gaseous envelope and turn into super-Earths (Kruijssen et al., 2020). Using the calculated phase space density of host stars as a me
