facF15a := [.748470355105891550*z^2-.189420908679096728e-16*y*z-.1176174526709\
87998*y^2-.620050589161347358e-15*x*z-.644500922888153909e-16*x*y-.26463782461\
5851392*x^2-.112229216822102019e-14*z+.366623797660837828e-15*y-.\
845993356501158328e-16*x+1.05854552288802518, .748512339272591420*z^2-.\
189414997685857004e-16*y*z+.117612498926570844*y^2-.720929737769598352e-15*x*z
+.194130248620201385e-15*x*y+.264629566433592812*x^2-.112225714641984741e-14*z
+.366612356945032926e-15*y+.600954036745012852e-16*x-1.05852404112954090];
t15a := 1.610;
berror15a := .86346748752581e-10;