ahhhhh I see. You are taking the half-way (vortex sum) points! So halfway between 1 and 2 is 1.5 v= 1 + 5 = 6.
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ahhhhh I see. You are taking the half-way (vortex sum) points! So halfway between 1 and 2 is 1.5 v= 1 + 5 = 6.