Rms of the activity time series in both directions for (from upper to lower panel) the X direction and ΔT_spot1, the Y direction and ΔT_spot1, the X direction and ΔT_spot2, and the Y direction and ΔT_spot2. Left column:rms of the astrometric signal vs. spectral type for the ten inclinations (from yellow for pole-on configurations to blue for edge-on configurations), and one simulation out of four for clarity (small dots) and binned in spectral type (circles). The horizontal dashed line is the solar value from Lagrange et al. (2011). Right column: same vs. .