Table 1: Water vapour seeing at three astronomical sites. The Fried parameter r₀ is given at 500 nm, adapted from the values of Racine (2005). References for the PWV data are given in the last column. The standard deviation of water vapour seeing at Dome C is deduced from the data at Cerro Paranal and Mauna Kea following Eq. (1). Water vapour seeing was measured on a baseline of 66 m (resp. 100 m) at Paranal (resp. Mauna Kea), and we assume that our estimate at Dome C is valid for a similar range of baseline lengths.
Site r₀ $\langle {\it PWV} \rangle$ $\sigma_{\it PWV}$ References

Cerro Paranal 14.5 cm 3 mm 27 $\mu$ m Meisner & Le Poole (2003)

Mauna Kea 17.8 cm 1.6 mm 11 $\mu$ m Colavita et al. (2004)

Dome C 38.2 cm 0.25 mm 1 $\mu$ m Bussmann et al. (2005)

**Table 1:** Water vapour seeing at three astronomical sites. The Fried parameter r₀ is given at 500 nm, adapted from the values of Racine (2005). References for the *PWV* data are given in the last column. The standard deviation of water vapour seeing at Dome C is deduced from the data at Cerro Paranal and Mauna Kea following Eq. (1). Water vapour seeing was measured on a baseline of 66 m (resp. 100 m) at Paranal (resp. Mauna Kea), and we assume that our estimate at Dome C is valid for a similar range of baseline lengths.
Site	r₀	$\langle {\it PWV} \rangle$	$\sigma_{\it PWV}$	References
Cerro Paranal	14.5 cm	3 mm	27 $\mu$ m	Meisner & Le Poole (2003)
Mauna Kea	17.8 cm	1.6 mm	11 $\mu$ m	Colavita et al. (2004)
Dome C	38.2 cm	0.25 mm	1 $\mu$ m	Bussmann et al. (2005)

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