Fig. 13.


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Number of bubbles per day for January (a), March (b), April (c) and June (d) 2014. Blue triangles correspond to the IGS stations used to design the model. Light blue stars correspond to additional receivers not used in the construction of the model. Numbers for each station correspond first to the number of bubbles observed per day and second to the number of bubbles expected per day according to the interpolation.

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