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  Fig. 3.19a-c : Diagrams to define the tangent vector, T, to a curved surface, s(u, v), in the direction of an arbitrary curve, c[u(t), v(t)]. a) Parameter plane. b) Three dimensional surface. c) Parameter plane with line in arbitrary direction. Reprinted from (Pollard et al., 2004) with permission from The Geological Society of London.  
         
 
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