Table 2: Diffuse interstellar bands investigated in this study. The EW and associated statistical error $\sigma _{\it EW}$ (derived from the adjacent continuum) is quoted in mÅ (first part, Col. 5). Observed central wavelengths, heliocentric velocities and FWHM are given in Cols. 2-4, respectively. For non-detected DIBs upper limits are calculated adopting EW $_{\rm upper\ limit}$ = $2 \ \sigma _{\rm noise}$ FWHM $_{\rm DIB}$, with  $\sigma _{\rm noise}$ the noise in the spectral range of the expected DIB, and FWHM $_{\rm DIB}$ the full width at half maximum of the corresponding DIB observed toward AzV 456. For AzV 18 the first two values are derived from spectra obtained in 2001 and 2003, respectively. The third value is obtained from Welty et al. (2006). Our DIB equivalent widths for AzV 456 are consistent with those derived by Welty et al. (2006). The reported high upper limits for the 5780 Å are due to the lower signal-to-noise in the spectral range and its larger FWHM. The DIB spectral ranges are plotted in Fig. 3. The \ensuremath {{E_{B-V}}} values were derived by subtracting the Milky Way foreground contamination from the line-of-sight reddening (see Sect. 4.2.1 and Table 1).
  SMC DIBs SMC DIBs: equivalent widths Galactic
  $\lambda $, v, FW, EW 2$\sigma $ upper limits $\zeta $-type $\sigma $-type
  AzV 456 AzV 18   AzV 214 AzV 398 AzV 65 Sk 191 HD 149757 HD 144217
\ensuremath {{E_{B-V}}} $_{\rm SMC}$ 0.27 0.17   0.16 0.29 0.08 0.06 0.32   0.20  
$\lambda_{\rm rest}$ $\lambda_{\rm observed}$ $v_{\rm observed}$ FW EW EW $_{2\sigma}$   EW $_{2\sigma}$ EW $_{2\sigma}$ EW $_{2\sigma}$ EW $_{2\sigma}$ EW FW EW FW
(Å) (Å) (km s-1) (Å) (mÅ) (mÅ)   (mÅ) (mÅ) (mÅ) (mÅ) (mÅ) (Å) (mÅ) (Å)
5780.55 $5782.7\pm0.5$ $112\pm26 $ 2.1 69 (20) 58 / x / 23   107 142 87 34 66 2.13 170 2.35
5797.1 $5799.7\pm0.1 $ $116\pm5 $ 0.6 36 (8) 15 / x / 8   15 23 17 7 27 0.67 23 0.97
5849.8 $5852.6\pm0.3 $ $119\pm15$ 0.84 28 (7) 18 / - / -   22 30 20 9        
6195.99 $6198.9\pm0.2 $ $122\pm10$ 0.4 12 (5) 5 / 6 / 1   14 16 12 4 9 0.54 19 0.45
6379.0 $6382.3\pm0.1 $ $117\pm5$ 0.5 23 (5) 8 / 9 / 5   16 20 15 6 21 0.55 12 0.62
6613.6 $6616.5\pm0.15$ $113\pm8$ 0.9 49 (10) 19 / x / 7   31 43 26 10 40 0.91 43 0.95
6284.0     5.0 (95) 68 / 86 / 25   91 150 110 102 130   355  

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