Table 1: Main properties of the emission lines detected in the optical spectrum of Swift J1656.3-3302. Line fluxes are reported with and without correction for the intervening Galactic extinction (see text). Equivalent Widths (EWs) are expressed in the observer's frame. Uncertainties are at 1-$\sigma $ confidence level.

Line		 Flux (10-15 erg cm-2 s-1) EW FWHM
  observed extinction- (Å) (km s-1)
    corrected    
Lyman-$\alpha $* $2.8 \pm0.3 $ $ 39\pm4 $ $263\pm26$ $\sim $9900
Si IV $0.41\pm0.12$ $4.4\pm1.3$ $ 30\pm10$ $\sim $5000
C IV $1.19\pm0.12$ $7.2\pm0.7$ $ 80\pm8 $ $\sim $6600
He II* $0.66\pm0.13$ $2.3\pm0.5$ $ 43\pm9 $ $\sim $12 000
C III]* $1.1 \pm0.1 $ $5.1\pm0.5$ $ 65\pm7 $ $\sim $9300

* Possibly blended with a fainter emission line (see text).

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