Calculated tidal Love number k₂ as a function of core mass and size fractions for three extreme cases (for details of these three extreme cases, see the text): the results for Case (1) are denoted by black solid lines with solid squares, the results for Case (2) are denoted by red dashed lines with solid circles, and the results for Case (3) are denoted by blue dotted lines with solid triangles (for details of these three extreme cases, see the text). The solutions for the case with the constant mass fraction m_C = 0.065 are also shown by green lines with open stars.