The detached dust and gas shells around the carbon star U Antliae

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Table 1:

Observations of the circumstellar environment of U Ant.
Instrument	Date	Filter	$\lambda_{{\rm cen}}$	$\Delta \lambda_{{\rm FWHM}}$	pixel	$\Delta v$	t
			[nm]	[nm]	[ $\hbox{$^{\prime\prime}$ }$ ]	[km s^-1]	[s]
EFOSC2	Apr. 2002	Str-y	548.2	18.2	0.32	-	5000
		F59	589.4	5	0.32	-	4600
		H $\alpha$	657.7	6.2	0.32	-	3900
		F77	769.9	5	0.32	-	90
EMMI	Mar. 2004	F59	589.4	5	0.33	4.7	9000
		F77	769.9	5	0.33	4.7	9000
APEX-2a	Dec. 2006	-	345 GHz	-	18^a	0.5	15 500

Notes. The total integration time for each polarisation angle is given for the EFOSC2 observations. For the APEX observations the total integration time for the map is given.
^(a) For APEX, ``pixel'' is the beam FWHM.

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