Estimates of sin i obtained, as a function of the rotation period, for CTTS (red; left panel) and WTTS (blue; right panel) in our sample with v sin i measurements from Baxter et al. (2009), periods from this study and R⋆ estimates from Venuti et al. (2014). The sin i = 1 level is marked as a black dashed line. Horizontal error bars are derived following Eq. (6). Vertical error bars are derived by standard error propagation on Eq. (9). A typical uncertainty of 5 km s-1 is assumed on v sini; this corresponds to the median difference between v sini estimates by Baxter et al. (2009) and those derived by S. Alencar from CSI 2264 VLT/FLAMES observations, for objects common to the two samples. Similarly, a typical uncertainty of 0.2 R⊙ is adopted for R⋆, that is the median difference between R⋆ estimates obtained by Venuti et al. (2014) and those of Rebull et al. (2002), for objects in common.
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