A variety of commonly used electron density models, which can give very different height estimates. For example, a density of 107 cm-3 can be located at ~1.4 R⊙ or ~2.0 R⊙, depending on the density model. Plotted for comparison, the set of density measurements obtained with Mars Express (MEX) between the years 2006−2008 (Verma et al. 2013).
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