Thanks for your comments ...

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Thanks for your comments Thinakaran and Stefanie. I have compared the values in both stations with a scatter graph and obtained a linear correlation between the values of R^2=0.78. When I apply this correlation to fill the missing values I obtain a good series but I cannot represent the offsets or lags between the waves. Would it be necessary to decompose the tidal information into astronomic and meteorological and compare the stations in order to obtain a better approximation? In that case please indicate best procedure to follow please?