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Change the relation (find the relation and press F2) for Intpol_Rel_B in
which uses the same data, but now performs a quadratic interpolation. It's not necessary to initialize existing solutions.
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In the class Geometry, add the following relation
Which relationWhich is the position in meters along the longitudinal direction of the ship. By now you should know a proper dimension, reference and determined by value should be provided.
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