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X(3), X(15), X(16), X(35), X(36), X(54), X(74), X(186), X(1154), X(1511), E(379), E(466), E(506), E(571), E(572), E(639), E(640), E(641), E(643) isogonal conjugates of the Ixanticevian points. See Table 23. 

It is a circular pivotal cubic with pivot O = X(3) and pole X(50). The tangent at O is the Euler line. The singular focus is the isogonal conjugate of X(3448). It is anharmonically equivalent to the Neuberg cubic. See Table 20. K073 contains the midpoints of the segments joigning O and the three common points of the circumcircle and the Napoleon cubic. See a figure at Q011. Locus properties :

