This applet calculates the normalized polarizability of the dielectric double hemisphere having the relative permittivities e1 and e2. The normalization means a division by the free-space permittivity and the volume of the full sphere. Note the uniaxial anisotropy of the particle: the polarizability is different in the axial and transversal directions. The digits shown are correct.
Reference: M. Pitkonen: An explicit solution for the electric potential of the asymmetric dielectric double sphere, Journal of Physics D: Applied Physics, Vol. 40, pp. 1483-1488, 2007.