Relative differences when calculating the radius of a pure iron sphere for different EoS. The reference radii are calculated using BICEPS. Dark blue lines: relative radius difference compared to the EoS of Hakim et al. (2018). Pink lines: relative radius difference using the EoS of Bouchet et al. (2013). Light blue lines: relative radius difference when adding to the core the maximum amount of sulfur considered in BICEPS.