$\begin{figure}\includegraphics[width=15cm]{DS1649f6.ps}\end{figure}$

Figure 6: The observed spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. The telluric standard, HD 32630, is shown on top. HD 205021, a slow rotator, is good for indicating positions of stellar lines, which are also identified on top. The stellar standard HD 37128 is a close match in spectral type for BD+63 $^{\circ }$ 1964. The fourth spectrum from the top, ``BD+63 $^{\circ }$ 1964/HD 37128'', corrects the stellar lines in BD+63 $^{\circ }$ 1964's spectrum, leaving only interstellar features, after division by the spectrum of HD 37128. This spectrum is shifted in velocity for adequate matching of stellar lines. The synthetic spectrum in absolute wavelength frame represents the absorption of DIBs measured in our spectrum of BD+63 $^{\circ }$ 1964, along with some important interstellar species. Note that the scale for BD+40 $^{\circ }$ 4220 is different to that of the other spectra and is displayed on the right

$\begin{figure}\includegraphics[width=15cm]{DS1649f7.ps}\end{figure}$

Figure 7: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. Note that the scale for BD+40 $^{\circ }$ 4220 is different to that of the other spectra and is displayed on the right. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f8.ps}\end{figure}$

Figure 8: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. Note that the scale for BD+40 $^{\circ }$ 4220 is different to that of the other spectra and is displayed on the right. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f9.ps}\end{figure}$

Figure 9: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. Note that the scale for BD+40 $^{\circ }$ 4220 is different to that of the other spectra and is displayed on the right. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f10.ps}\end{figure}$

Figure 10: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. Note that the scale for BD+40 $^{\circ }$ 4220 is different to that of the other spectra and is displayed on the right. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f11.ps}\end{figure}$

Figure 11: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. Note that the scale for BD+40 $^{\circ }$ 4220 is different to that of the other spectra and is displayed on the right. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f12.ps}\end{figure}$

Figure 12: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. Note that the scale for BD+40 $^{\circ }$ 4220 is different to that of the other spectra and is displayed on the right. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f13.ps}\end{figure}$

Figure 13: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. Note that the scale for BD+40 $^{\circ }$ 4220 is different to that of the other spectra and is displayed on the right. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f14.ps}\end{figure}$

Figure 14: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. Note that the scale for BD+40 $^{\circ }$ 4220 is different to that of the other spectra and is displayed on the right. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f15.ps}\end{figure}$

Figure 15: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. Note that the scale for BD+40 $^{\circ }$ 4220 is different to that of the other spectra and is displayed on the right. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f16.ps}\end{figure}$

Figure 16: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. Note that the scale for BD+40 $^{\circ }$ 4220 is different to that of the other spectra and is displayed on the right. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f17.ps}\end{figure}$

Figure 17: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. Note that the scale for BD+40 $^{\circ }$ 4220 is different to that of the other spectra and is displayed on the right. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f18.ps}\end{figure}$

Figure 18: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. Note that the scale for BD+40 $^{\circ }$ 4220 is different to that of the other spectra and is displayed on the right. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f19.ps}\end{figure}$

Figure 19: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f20.ps}\end{figure}$

Figure 20: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f21.ps}\end{figure}$

Figure 21: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f22.ps}\end{figure}$

Figure 22: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f23.ps}\end{figure}$

Figure 23: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6. The bottom panel depicts a wavelength region not tellurically corrected due to the presence of a stellar line in the telluric standard

$\begin{figure}\includegraphics[width=15cm]{DS1649f24.ps}\end{figure}$

Figure 24: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details. Telluric correction was applied to the spectra shown in the top panel

$\begin{figure}\includegraphics[width=15cm]{DS1649f25.ps}\end{figure}$

Figure 25: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f26.ps}\end{figure}$

Figure 26: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f27.ps}\end{figure}$

Figure 27: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f28.ps}\end{figure}$

Figure 28: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f29.ps}\end{figure}$

Figure 29: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f30.ps}\end{figure}$

Figure 30: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details. Telluric correction was applied to the spectra shown in the bottom panel

$\begin{figure}\includegraphics[width=15cm]{DS1649f31.ps}\end{figure}$

Figure 31: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6. Telluric correction was applied to the spectra shown in the top panel

$\begin{figure}\includegraphics[width=15cm]{DS1649f32.ps}\end{figure}$

Figure 32: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details. Telluric correction was applied to the spectra shown in both the top and bottom panels

$\begin{figure}\includegraphics[width=15cm]{DS1649f33.ps}\end{figure}$

Figure 33: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details. Telluric correction was applied to the spectra shown in the top panel

$\begin{figure}\includegraphics[width=15cm]{DS1649f34.ps}\end{figure}$

Figure 34: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f35.ps}\end{figure}$

Figure 35: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details. Telluric correction was applied to the spectra shown in the bottom panel

$\begin{figure}\includegraphics[width=15cm]{DS1649f36.ps}\end{figure}$

Figure 36: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details. Telluric correction was applied to the spectra shown in the top panel

$\begin{figure}\includegraphics[width=15cm]{DS1649f37.ps}\end{figure}$

Figure 37: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details. Telluric correction was applied to the spectra shown in both the top and bottom panel

$\begin{figure}\includegraphics[width=15cm]{DS1649f38.ps}\end{figure}$

Figure 38: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f39.ps}\bigskip \end{figure}$

Figure 39: The spectrum of BD+63 $^{\circ }$ 1964, HD 183143, BD+40 $^{\circ }$ 4220 and other standard stars used in the DIB survey. See Fig. 6 for details

$\begin{figure}\includegraphics[width=15cm]{DS1649f40.ps}\end{figure}$

Figure 40: The spectra of reddened and unreddened stars used in the DIB survey. This figure shows selected orders which are affected by atmospheric contamination. Each figure on the left shows the contaminated order. The figures on the right show the corrected order using the telluric standards HD 32630, HD 164353 and HD 188209. See Sect. 3.2

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