Table 2: H${\alpha }$ EW measurements obtained from 1992 to 2006*.

Date		 MJD Orb. phase Observatory Instrument Resolution Setting** H${\alpha }$ EW Error
(yyyy-MM-dd)             (Å) (Å)

1992-04-19		 48 731.250 0.85 ESO-2.20 EFOSC2 3000 - -2.80 0.07
1993-06-19 49 257.010 0.45 OHP-193 CARELEC 450* - -2.50 0.10
1999-08-18 51 408.842 0.35 OAB BFOSC 1600 Grism#7 -2.60 0.10
2000-09-08 51 795.813 0.42 OHP-193 ELODIE 45 000 - -3.24 0.10
2000-09-10 51 797.768 0.92 OHP-193 ELODIE 45 000 - -2.91 0.15
2000-09-12 51 799.768 0.43 OHP-193 ELODIE 45 000 - -3.23 0.15
2000-10-18 51 835.984 0.70 ESO-1.52 FEROS 48,000 - -2.64 0.05
2000-10-19 51 836.983 0.96 ESO-1.52 FEROS 48,000 - -2.61 0.05
2000-10-20 51 838.000 0.22 ESO-1.52 FEROS 48,000 - -2.71 0.05
2001-05-24 52 053.424 0.37 ESO-VLT-U1 FORS1 990 GRIS_600V -2.69 0.07
2001-05-26 52 055.417 0.88 ESO-VLT-U1 FORS1 990 GRIS_600V -2.69 0.07
2001-08-25 52 146.858 0.29 OHP-193 ELODIE 45 000 - -2.95 0.10
2001-08-26 52 147.857 0.55 OHP-193 ELODIE 45 000 - -2.98 0.10
2001-08-28 52 149.848 0.06 OHP-193 ELODIE 45 000 - -2.91 0.20
2001-08-30 52 151.822 0.56 OHP-193 ELODIE 45 000 - -2.92 0.20
2001-10-06 52 188.978 0.08 ESO-1.52 FEROS 48 000 - -2.64 0.10
2001-10-07 52 189.992 0.33 ESO-1.52 FEROS 48 000 - -2.79 0.10
2001-10-08 52 191.050 0.60 ESO-1.52 FEROS 48 000 - -2.50 0.15
2001-10-09 52 192.000 0.85 ESO-1.52 FEROS 48 000 - -2.53 0.10
2002-06-14 52 439.340 0.17 ESO-NTT EMMI 5000 - -2.81 0.05
2002-07-08 52 463.335 0.31 ESO-NTT EMMI 5000 - -2.78 0.05
2002-07-09 52 464.141 0.52 ESO-NTT EMMI 5000 - -2.80 0.05
2002-07-10 52 465.052 0.75 ESO-NTT EMMI 5000 - -2.72 0.10
2002-07-11 52 466.214 0.06 ESO-NTT EMMI 5000 - -2.70 0.05
2004-07-13 53 199.923 0.89 OHP-193 CARELEC 900* Grating 133/375 -2.60 0.10
2004-07-14 53 200.937 0.15 OHP-193 CARELEC 900* Grating 133/375 -2.54 0.10
2004-07-16 53 202.936 0.66 OHP-193 CARELEC 900* Grating 133/375 -2.44 0.10
2004-07-18 53204.906 0.17 OAB BFOSC 2000 Grism#8 -2.47 0.10
2004-09-02 53 250.935 0.95 LNA-0.60 ESPCASS 1460 - -2.60 0.10
2005-04-07 53 467.299 0.34 LNA-1.60 ESPCASS 3,600 Grating 1200/750 -2.83 0.10
2005-04-07 53 467.299 0.34 LNA-1.60 ESPCASS 3,600 Grating 1200/750 -2.77 0.10
2005-07-31 53 583.748 0.16 ESO-NTT EMMI 1100 Grism#5 -2.55 0.05
2005-08-20 53 602.935 0.07 LNA-1.60 ESPCASS 2,500 Grating 900/550 -2.39 0.05
2005-08-20 53 602.963 0.08 LNA-1.60 ESPCASS 2,500 Grating 900/550 -2.34 0.05
2005-08-21 53 603.078 0.10 LNA-1.60 ESPCASS 2,500 Grating 900/550 -2.43 0.05
2005-09-30 53 643.005 0.33 LNA-1.60 ESPCASS 730 Grating 300/640 -2.51 0.10
2006-05-07 53 862.181 0.44 NOT ALFOSC 3000 Grism#16 -2.40 0.10
* Spectra with EW values corrected for the presence of blended telluric lines.
** The setting of the instrument is shown when relevant.

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