Survivor ratio of VTs under the Yarkovsky effect. Black refers to the results of an integration to 1 Gyr, and red shows this for 4.5 Gyr. The crosses and open circles refer to the results with and without GR, respectively. The survivor ratio of 1.0 right at the centre shows the case ȧ_Y = 0 (without the Yarkovsky effect). Solid lines are the fitting curves of the data for 4.5 Gyr with GR (red crosses, see text).