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Figure 6.18 Here lines of more than 0.2 % of the geometric mean of the resi-
dent populations of the areas of origin and destination are drawn between 9289
1981 census wards on an equal land area map, coloured according to the mix of
occupations at the place of origin. The picture tends to be mainly blue as only
professionals tend frequently to migrate long distances, but also because of the
projection used.
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