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Figure 5.4 - Half-model in oblique translation (positive drift, 
permanent motion). 
The streamlines of the relative motion are more inclined towards 
starboard than towards port. The lines ending on a same point of the 
longitudinal contour SS,E, do not have the same direction, hence 
the shedding of free vortices along SSE. 
EL streamlines starting points on the stem, 
si end point of the starboard streamlines, 
sa end point of the port streamlines. 
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