is the variance of the parameter $i$. We consider 2$\sigma$ contours, for which $\Delta\chi^2(95.4\%)=6.17$, and obtain ${\rm FoM} \simeq 19$ for the WMAP5 contour and ${\rm FoM} \simeq
44$ for the combined (WMAP5 + CFHTLS) case, corresponding to a gain of a factor of 2.3. The two parameters $\omega_{\mathrm{cdm}}$ and $\omega_\nu$ are, however, strongly correlated, exhibiting a narrow, long combined contour and the effective gain in the $\omega_\nu$ variance is of only 1.2.

The introduction of distance measurements (BAO+SNe) is useful, since its combination with WMAP5 data (also shown in Fig. \[fig:joint\], left panel) defines a narrow region in the $(\omega_{\mathrm{cdm}},\omega_\nu)$ plane that complements that of the WMAP5+CFHTLS data. Both cases thus probe orthogonal combinations of the two parameters and, furthermore, in a way that is independent of the spectral index, since this is already well determined by the CMB data alone (as shown in Fig. \[fig:joint\], middle panel). Their combination thus has the same properties we were looking for when discussing the possibility of using sub- and super-free-streaming scales from cosmic shear alone, along with the need for an independent measure of ${n_\mathrm{s}}$. This means that the combination of the two cases (WMAP5 + BAO + SNe + CFHTLS) 