Table 1: South Pole seeing as measured by the A-DIMM in 2001 at a wavelength of 500 nm. It is compared to other seeing measurements done at the South Pole. All values are in arcseconds.

Instrument	Sample size (days)	Mean	Std. Dev.	Median	Best 25%	Best	Worst
A-DIMM (This work)	101	1.90	0.60	1.82	1.43	0.46	3.72
SODAR (Travouillon et al. 2003)	269	1.73	1.07	1.59	1.17	<0.3	8.11
Microthermals (Marks et al. 1999)	16	1.86	0.75	1.6	1.0	0.8	3.1
H-DIMM (Loewenstein et al. 1998)	28	1.53	-	1.64	-	0.6	6.2