Fig. 3From: Quasi-4-dimension ionospheric modeling and its application in PPPDistribution of the 2-dimensional TEC map with the resolution of \(12\times 8\), \(24\times 16\), \(36\times 24\), and \(48\times 32\) in latitude and longitude for Q4DIM-2D on DOY 001, 2020Back to article page