Fig. 5

Fig. 5 Refer to the following caption and surrounding text.

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Map of the first vertical derivative highlighting the geometry of the MHFZ. Note the different abrupt changes of the MHFZ orientation from the SNCB to the LCB. The map is projected with the Lambert 93 system. The vertical and horizontal represent the grid used to compute the map and not the longitude and latitude lines. The later are represented by the cross visible on the map.

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