Core and surface (solid and dotted lines) rotation rates as a function of gravity for rotating models of the six subgiants. These models are computed with an additional viscosity ν_add of 1.5 × 10⁴, 1.7 × 10⁴, 6 × 10³, 6 × 10³, 1 × 10⁴ and 4 × 10³ cm² s⁻¹ for stars A, B, C, D, E and F, respectively. The initial velocity on the ZAMS is equal to 6, 5, 5, 6, 8 and 4 km s⁻¹ for stars A, B, C, D, E and F, respectively. Dots and open circles indicate the values of core and surface rotation rates determined for the six subgiants from asteroseismic measurements (Deheuvels et al. 2014).