**Table 1:** Frequency analysis of the average radial velocity curves of telluric lines, Fe I and II, Nd III and Nd II. N indicates the number of lines measured. $A_{\rm max}$ gives the highest radial velocity amplitude, followed by the estimate of False Alarm Probability of the corresponding signal. The last two columns give the amplitude of the variation with $\nu =1.85$ mHz (P=9.01 min) and the noise estimate.
Ion	N	$A_{\rm max}$	FAP	A	$\sigma$
		(m s^-1)		(m s^-1)	(m s^-1)
Full data set
Telluric	15	7.9	0.31	$2.5\pm2.5$	2.6
Fe I, II	49	6.2	0.31	$1.5\pm1.8$	1.8
Nd II	56	29.1	6.6E-05	$24.6\pm4.8$	4.9
Nd III	29	20.5	3.6E-06	$20.4\pm3.0$	3.0
First 1.8 h
Nd II	56	46.2	8.7E-06	$44.2\pm5.5$	5.5
Nd III	29	36.5	1.1E-06	$36.4\pm3.8$	3.7

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