Calculation: n1DEc3 - 1

 x^2+ y^2+ z^2  = 
 R^2
 x^2+ y^2+ z^2 =  R^2x^2+y^2+z^2 = R^2
 x^2 =  R^2- y^2- z^2x^2 = R^2-y^2-z^2
x = saknis( R^2- y^2- z^2)x = saknis(R^2-y^2-z^2)