Fig.1　Isolines of sound speed in the Norway Sea. Dashed line is the observed and the solid lines is tomographic inferred.

Fig.2　The geometry of the MHRT numerical experiment. The tonal source is towed by the vessel.

Fig.3　The maximum sound speed error of the retrieved “Meddy” after second iteration.

Fig.4　The geometry of transverse current monitoring by MHRT.

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