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$\begin{figure} {\psfig{figure=5656fig1.ps,width=8cm,height=7.5cm,angle=-90} } \end{figure}$ Figure 1: The deceleration parameter as a function of redshift for some selected combinations of the pair ( $\tilde{A}$ , $\alpha$ ) and $\Omega _{\rm m,0} = 0.3$ . The horizontal dashed line divides decelerating and accelerating universes. Note that a number of different possibilities for the recent past and future of the Universe can be achieved from parametrization (1). The standard $\Lambda$ CDM model (thick line) is also shown for the sake of comparison.
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In the text

$\begin{figure} {\psfig{figure=5656fig2.ps,width=8cm,height=7.5cm,angle=-90} } \end{figure}$ Figure 2: The transition redshift z_* as a function of the parameter $\tilde{A}$ for values of $\alpha$ lying in the interval [ $\frac{1}{2}$ , 2]. Horizontal lines stand for the 1 $\sigma$ interval $0.33 \leq z_* \leq 0.59$ , as provided by current SNe Ia observations (Riess et al. 2004). Note that our current standard model, i.e., the $\Lambda$ CDM scenario, predicts a transition epoch $\simeq$ $2\sigma$ off from the central value obtained in Riess et al. (2004).
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In the text

$\begin{figure} {\psfig{figure=5656fig3.ps,width=8cm,height=7.5cm,angle=-90} } \end{figure}$ Figure 3: The linear growth rate $f(z_{\rm 2df})$ as a function of index $\alpha$ for some selected values of parameter $\tilde{A}$ . Note that, while the quantity $f(z_{\rm 2df})$ is an insensitive function of $\alpha$ , it strongly depends on the parameter $\tilde{A}$ .
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In the text

$\begin{figure} {\psfig{figure=5656fig4.ps,width=8.5cm,height=8cm,angle=0} } \end{figure}$ Figure 4: The plane $\tilde{A}-\alpha$ for the EOS parametrization discussed in this paper. The curves correspond to confidence regions of $68.3\%$ and 95.4 $\%$ for a joint analysis involving SNe Ia, growth of structure index, and the age of the Universe, as discussed in the text. Note that, although the parameter $\tilde{A}$ is restricted to the interval $-0.06 \lesssim \tilde{A} \lesssim 0.12$ at 95.4% c.l., parameter $\alpha$ is completely unconstrained by the current observational data.
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In the text

$\begin{figure} {\psfig{figure=5656fig3.ps,width=8cm,height=7.5cm,angle=-90} } \end{figure}$	Figure 3: The linear growth rate $f(z_{\rm 2df})$ as a function of index $\alpha$ for some selected values of parameter $\tilde{A}$ . Note that, while the quantity $f(z_{\rm 2df})$ is an insensitive function of $\alpha$ , it strongly depends on the parameter $\tilde{A}$ .
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