Second moments of the velocity components for the BJ sample. From top to bottom, the panels show $\sqrt{\langle v_R^2\rangle },\sqrt{\langle v_{\varphi }^2\rangle }$, and $\sqrt{\langle v_{ɀ}^2\rangle }$. The background histograms show the distribution of ||(υυ^T − C)_ii|| for our sample: the diagonal elements of the velocity tensor for each star. The red data points show the square root of the second moment of the sample in the radial bins. The error bars show the 1σ errors from bootstrapping. Bins with less than 15 stars are not shown since they typically produce spurious results.