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too complicated to be written here. Click on the link to download a text file. 

X(1), X(2), X(3), X(4), X(6), X(23), X(67), X(1113), X(1114), X(2574), X(2575) excenters antipoints, see Table 77 

See Q170 for general properties. Q185 is the locus of P such that PC(P) passes through X(2) and X(23) or, equivalently, PC(P) is centered on the line {351, 523, 7426, etc}. Q185 is a bicircular sextic with two real asymptotes parallel at X(13857) to those of the Jerabek hyperbola (J). 
