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...ylab="Coordinate 2", main="Metric MDS",type="n") text(fit1$points, labels = c('A','B','C'), cex=1) So far so good, until I add more points. Now assume, I add a fourth point D at {0,2*sqrt(3)}. This produces the rectangular triangle ABD with hypothenuse BD that encompasses the smaller triangle ABC such that C lies in the middle between B and D. Then, MDS should reproduce the rectangular triangle ABD and the equilateral triangle ABC within it. However, even though distance matrix d2 below still indicates that ABC is an equilateral triangle, the plo...