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X(6), X(69), X(193) 

K707 is a central cubic with center K. It is the locus of P such that spK(P, K) is a pivotal cubic. See CL055. Recall that spK(P, K) always contains the foci of the "ellipse K", the inconic with center K. For example, spK(K, K) = K102 = pK(X6, X6), spK(X69, K) = K233 = pK(X25, X4), spK(X193, K) = K168 = pK(X3, X2). 
