Let O be the circumcenter; Oa, Ob, Oc its orthogonal projections on the altitudes. Let Oab, Oac be the orthogonal projections of Oa on the B- and C- altitudes and define analogously Obc, Oba, Oca, Ocb. The parallels to the Euler lines de Euler of OaOabOac, ObObcOba, OcOcaOcb
from A, B, C: concur at the point X(74)
from the midpoints of the sides: concur in the complement of the point X(74)
from the altitude feet A', B', C': concur at a point