Estimated cloud size and electron density for the second component of the ESE depending on its distance to the Earth, represented as solid lines in the plot. Horizontal lines represent literature values without distance estimates. The vertical line represents the distance estimate for the structures that cause the scattering “echoes” from our companion paper (Michilli et al. 2018). The cloud size estimates of Cognard et al. (1993) for the two clouds forming the ESE are very similar(0.050 and 0.094 AU) and thus indistinguishable in the plot. The error bars on the cloud sizes of Coles et al. (2015) represent the non-spherical character of the clouds and not the actual uncertainty of the cloud size.
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