Two-dimensional surfaces of equilibrium models of differentially rotating neutron stars embedded in the space . The first panel is for α = −1, the second one is for α = −2, and the last one is for α = −4. These correspond to “j-const.”, “v-const.”, and “HMNS” rotation laws, respectively. The points at the bottom of each panel are drawn to clarify which of the three terminal conditions (see Sect. 3.4) of sequence applies. The black triangles are for sequences reaching T/|W| = 0.125, dots are for sequences terminating with mass shedding, and the right edge of each surface (low ) corresponds to a topology change. The limit corresponds to uniform rotation.