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Figure 2


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S4 values observed in the L1 (a1) and L2 signals (a2) transmitted by GPS SVID 15 and observed by the Dallas ScintPi 3.0 monitor. S4 for signals from all satellites with elevation greater than 25° are shown. C/No values for L1 (b1) and L2 signals (b2) transmitted by GPS SVID 15. Panel (c) shows the TEC estimated from L1 and L2 phase measurements for GPS SVID 15.

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