Semimajor axis migration timescales t_a (top panel) and eccentricity damping timescales te (bottom panel) as a function of e/h_g. The red and blue lines indicates the prescriptions from IDA20 and CN08, respectively. Both cases consider an inner planet with mass MMars located at a = 0.02 au. The red dot indicates e = 0.2 from the IDA20 prescription, and the blue dot shows e = 0.05 from CN08. The solid black line represents the limit between subsonic and supersonic regime.