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Fig. 8.9 Azimuth ( thin lines ) and dip ( solid lines marked with amount of dip) of best-fitting unit
vector fields on ( top ) quadratic and ( bottom ) cubic solution, for area outlined on Fig. 8.7 . Zero-dip
line in cubic solution is close to similar line previously drawn by hand in Fig. 8.7 (Note that axes of
synclines on limbs of superimposed anticline tend to coincide with isolated segments of Permo-
Triassic ( dotted pattern ) enclosed by crystalline rocks in B) (Source: Agterberg 1974 , Fig. 112)
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