Figure 6
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On DOY 249 (September 6, 2017), residual histograms and scatter plots compare HBN TEC, KF TEC, and IRI TEC against CODE TEC. Black solid lines in (a)–(c) indicate a mean of zero, while in (d)–(f), they represent linear regression lines, reflecting the relationship between model estimates and CODE TEC values. Note: “KF” refers to the Kalman Filter-based method for TEC estimation.
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