and discussion below. If this is a general feature or depends on the models or dataset used has to be further investigated.

![68% and 95% confidence level contours, in the plane $\Omega_{m0}\times\Omega_{\Lambda0}$, for the $\Lambda$CDM model. We marginalized over all other parameters with flat prior. The solid (dashed) lines are the results for the likelihood ($\chi^2$) approach. The black circle (gray square) is the best fit value for the likelihood ($\chi^2$). *Left panel:* Results for the MLCS2k2 version of the SDSS compilation. *Right panel:* Results for the SALT2 version of the SDSS compilation. \[fig:SDSS\_LCDM\_cosmopar\]](FIG1_a.eps "fig:"){width="49.00000%"} ![68% and 95% confidence level contours, in the plane $\Omega_{m0}\times\Omega_{\Lambda0}$, for the $\Lambda$CDM model. We marginalized over all other parameters with flat prior. The solid (dashed) lines are the results for the likelihood ($\chi^2$) approach. The black circle (gray square) is the best fit value for the likelihood ($\chi^2$). *Left panel:* Results for the MLCS2k2 version of the SDSS compilation. *Right panel:* Results for the SALT2 version of the SDSS compilation. \[fig:SDSS\_LCDM\_cosmopar\]](FIG1_b.eps "fig:"){width="49.00000%"}

![68% and 95% confidence level contours, in the plane $\Omega_{m0}\times w$, for the F$w$CDM model. We marginalized over all other parameters with flat prior. The solid (dashed) lines are the results for 