Correction to: 'Methodology and consistency of slant and vertical assessments for ionospheric electron content models' and to 'Consistency of seven different GNSS global ionospheric mapping techniques during one solar cycle'

In the original publication of the articles, “Methodology and consistency of slant and vertical assessments for ionospheric electron content models” and “Consistency of seven different GNSS global ionospheric mapping techniques during one solar cycle”, a common typo affecting the text only (not the computations) has been recently noticed. It compromised the definition of the scaling factor from Global Navigation Satellite Systems ionospheric delay to electron content is clarified in this erratum.