Thank you for your answer,

but my problem concerns the support vectors. Indeed the two classes are 
well separated and the hyperplane is linear but the support vectors aren't 
aligned in parallel to the hyperplane. And according to me,  the support 
vectors (for each class) should be aligned along the linear hyperplane and 
form the marge (by definition). But it's not the case. In fact,  I'd like 
to understand why they are not aligned. 

I hope my questions are clear.
Thank you very much.
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