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Fig. 4.


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Calculated ∆f calc versus measured ∆f meas values of the IAR frequency scale as a result of calculations based on the modified IRI-2012 model with the inclined profile elongated along the local geomagnetic field line. Bold brown line is the regression line running through the origin of coordinates; thin lines are the 99% confidence limits; gray line is the line of perfect match Δf calc = Δf meas.

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