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Comparison between the values of Vzp obtained over Campo Grande. Ionosonde measured values are presented in blue (CG-COPEX), and theoretical Vzp values are presented in red [CG-COPEX(δ)]. The theoretical Vzp values were obtained using the values from ionosonde data over Cachimbo equatorial station and the expression for δ. The gray dashed curve corresponds to the Vzp obtained from ionosonde over Cachimbo and is provided for reference.

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