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Correction of results by taking into account the difference between the predicted and measured f0F2: (a) ∆fcalc deviation from ∆fmeas versus the difference between F2 layer critical frequency f0F2 estimated by the IRI-2012 model and that measured by DPS-4 Digisonde®; dashed line is the regression line running through the origin of coordinates; thin lines are 99% confidence limit lines; (b) the same as in Figure 3, but with correction taking into account the Δfcalc − Δfmeas difference dependence on the IRI-2012 model’s inaccuracy in f0F2 estimates.
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