  Due to a new measurement of the Xi(0) mass,the Coleman-Glashow formula for
the baryon octet e.m. masses (derived using unbroken SU(3) is satisfied to an
extraordinary level of precision.The same unexpected precision exists for the
Gell-Mann Okubo formula and for its octet-decuplet extension
(G.Morpurgo,Phys.Rev.Lett. 68(1992)139).We show that the old question "why do
they work so well?" is now answered by the general parameterization method.
