Table 1: Orbital parameters of the Gl 581 planetary system, as derived from the fit of Udry et al. (2007).
Planet Period (days) Semi-major axis (AU) Eccentricity $\omega$ (deg) $t_{\rm p}$ ( ${\rm JD}-2~400~000$ ) Mass ( $M_\oplus$ )

Gl 581 b $5.36843\pm0.00031$ $0.04061\pm0.16\times10^{-6}$ $0.01374\pm0.01405$ $273.21195\pm60.54198$ $52998.74631\pm0.90393$ $15.82\pm0.25$

Gl 581 c $12.92648\pm0.00723$ $0.07295\pm2.7\times10^{-4}$ $0.15926\pm0.05981$ $257.41189\pm24.37209$ $52993.40770\pm1.00130$ $5.073\pm0.31$

Gl 581 d $83.22730\pm0.65845$ $0.2525\pm0.013$ $0.12118\pm0.12034$ $317.01021\pm41.79575$ $52946.80339\pm11.49888$ $7.804\pm0.69$

**Table 1:** Orbital parameters of the Gl 581 planetary system, as derived from the fit of Udry et al. (2007).
Planet	Period (days)	Semi-major axis (AU)	Eccentricity	$\omega$ (deg)	$t_{\rm p}$ ( ${\rm JD}-2~400~000$ )	Mass ( $M_\oplus$ )
Gl 581 b	$5.36843\pm0.00031$	$0.04061\pm0.16\times10^{-6}$	$0.01374\pm0.01405$	$273.21195\pm60.54198$	$52998.74631\pm0.90393$	$15.82\pm0.25$
Gl 581 c	$12.92648\pm0.00723$	$0.07295\pm2.7\times10^{-4}$	$0.15926\pm0.05981$	$257.41189\pm24.37209$	$52993.40770\pm1.00130$	$5.073\pm0.31$
Gl 581 d	$83.22730\pm0.65845$	$0.2525\pm0.013$	$0.12118\pm0.12034$	$317.01021\pm41.79575$	$52946.80339\pm11.49888$	$7.804\pm0.69$

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