This figure is showing the evolution over time of the residuals of the solar rotation rate. A running mean over 10 years have been substracted to the rotation rate inferred from SOHO/MDI and SDO/HMI f-modes splitting. For the 5 first and last years, the mean over the first and last 10 years are used as reference. The average depth is 0.99 Solar Radius or about 7 Mm below the photosphere. The top panel is showing flow speed in meter per second while the bottom panel shows rotation rate in nHz (Adapted from Corbard & Thompson, 2002, Solar Phys, 205, 211). Data are provided by Jesper Schou and the SDO/HMI Team.