Fig. 3.


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Examples of time variations of the TEC (left plots) and SIGMA(2DTEC) (middle plots) over the indicated day, and of its cumulative number (right plots) for a quiet day (upper plots) and disturbed day (lower plots). Light green shows the TEC estimated by the phase delays (LI), blue dots shows the TEC estimated by the code delays (PI) and red dots correspond to the 5-points smoothed code delays (PIs).

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