\begin{table}%t5 \caption{\label{t5}Line identification in the optical spectrum of V645~Cyg.} \par \small%\centering \par \begin{tabular}{crrrlclcrrrlcl} \hline\hline $\lambda$& $EW$ & $I/I_{\rm c}$& $V_{\rm r}$& ID & {\it FWHM} & Comment &$\lambda$& $EW$ & $I/I_{\rm c}$& $V_{\rm r}$& ID & {\it FWHM} & Comment \\ \hline 4320.97 & 0.36 & 1.33 &$-$62.5& Ti II (41)& 1.02 & n & 5657.92 & 0.69 & 1.32 &$-$38.2& Fe II (57)& 2.14 & b \\ 4330.26 & 0.00 & 1.33 &$-$47.8& Ti II (94)& 0.00 & n, b w/H$\gamma$& 5662.94 & 0.28 & 1.14 &$-$47.7& Fe I (924)& 1.84 & ID: \\ 4340.47 & 3.20 & 0.30 &$-$313.1& H I (1)& 5.31 & P Cyg & 5667.16 & 0.00 & 1.11 &$-$33.9& Sc II (29)& 0.00 & +f \\ 4340.47 & 7.18 & 3.08 &$-$12.5& H I (1)& 4.12 & & 5669.03 & 0.42 & 1.15 &$-$48.7& Sc II (29)& 0.00 & \\ 4351.76 & 2.18 & 1.86 &$-$45.5& Fe II (27)& 2.58 & & 5684.19 & 0.22 & 1.14 &$-$42.8& Sc II (29)& 1.59 & \\ 4374.83 & 0.00 & 1.88 &$-$40.4& Ti II (93)& 0.00 & b & 5780.41 & 0.63 & 0.74 &$-$27.0& DIB & 2.32 & \\ 4385.38 & 3.60 & 2.10 &$-$52.7& Fe II (27)& 3.45 & n, b: & 5796.03 & 0.20 & 0.84 &$-$28.5& DIB & 1.16 & \\ 4395.03 & 1.74 & 1.76 &$-$34.1& Ti II (19)& 2.13 & & 5889.95 & 0.00 & 0.11 &$-$58.1& Na I (11)& 0.00 & \\ 4399.86 & 1.32 & 1.70 &$-$40.9& Fe II (20)& 2.17 & & 5889.95 & 0.00 & 0.00 &$-$35.7& Na I (11)& 0.00 & \\ 4416.82 & 1.78 & 1.59 & 0.7& Fe II (27)& 3.09 & b: & 5889.95 & 0.00 & 0.00 &$-$10.2& Na I (11)& 0.00 & \\ 4421.95 & 0.30 & 1.20 &$-$23.8& Ti II (93)& 1.61 & & 5895.92 & 0.00 & 0.17 &$-$57.5& Na I (11)& 0.00 & \\ 4443.80 & 1.51 & 1.57 &$-$37.8& Ti II (19)& 2.50 & & 5895.92 & 0.00 & 0.00 &$-$36.6& Na I (11)& 0.00 & \\ 4489.19 & 0.00 & 1.66 &$-$44.8& Fe II (37)& 0.00 & +f & 5895.92 & 0.00 & 0.09 &$-$12.7& Na I (11)& 0.00 & \\ 4491.40 & 3.48 & 1.88 &$-$57.4& Fe II (37)& 4.84 & & 5991.38 & 0.90 & 1.41 &$-$42.6& Fe II (46)& 2.16 & \\ 4501.27 & 0.64 & 1.42 &$-$54.6& Ti II (31)& 1.43 & P Cyg: & 6084.11 & 0.45 & 1.21 &$-$44.9& Fe II (46)& 2.15 & \\ 4508.28 & 1.14 & 1.68 &$-$47.2& Fe II (38)& 1.71 & P Cyg & 6102.72 & 0.05 & 1.03 &$-$23.6& Ca I (3)& 1.50 & \\ 4515.34 & 0.60 & 1.44 &$-$48.5& Fe II (37)& 1.37 & P Cyg & 6113.33 & 0.00 & 1.05 &$-$63.3& Fe II (46)& 0.00 & +f \\ 4520.23 & 0.00 & 1.34 &$-$37.2& Fe II (37)& 0.00 & +f & 6114.60 & 0.00 & 1.05 &$-$36.8& N II (7)& 0.00 & \\ 4522.63 & 1.88 & 1.67 &$-$50.4& Fe II (38)& 3.41 & & 6122.22 & 0.09 & 1.05 &$-$49.0& Ca I (3)& 1.65 & \\ 4534.16 & 1.15 & 1.54 &$-$50.9& Fe II (37)& 1.34 & P Cyg: & 6129.71 & 0.09 & 1.05 &$-$52.4& Fe II (46)& 1.88 & \\ 4549.47 & 1.80 & 1.90 &$-$38.9& Fe II (38)& 1.95 & P Cyg & 6141.72 & 0.16 & 1.12 &$-$45.9& Ba II (2)& 1.56 & \\ 4555.89 & 1.17 & 1.50 &$-$77.7& Fe II (37)& 2.23 & b: & 6147.73 & 1.93 & 1.54 & $-$2.9& Fe II (74)& 3.28 & b: \\ 4558.58 & 0.54 & 1.41 &$-$43.4& Fe II (20)& 1.16 & & 6191.56 & 0.33 & 1.18 &$-$41.2& Fe I (169)& 1.79 & \\ 4563.76 & 0.82 & 1.51 &$-$40.1& Ti II (50)& 1.51 & P Cyg: & 6195.00 & 0.06 & 0.95 &$-$14.5& DIB & 0.84 & \\ 4571.97 & 0.94 & 1.55 &$-$42.0& Ti II (82)& 1.64 & P Cyg & 6219.54 & 0.14 & 1.06 &$-$47.3& Fe II (34)& 2.50 & \\ 4576.33 & 0.26 & 1.30 &$-$48.5& Fe II (38)& 0.77 & & 6238.38 & 1.35 & 1.46 &$-$32.2& Fe II (74)& 2.83 & \\ 4583.82 & 1.90 & 1.95 &$-$46.5& Fe II (38)& 1.91 & P Cyg & 6247.56 & 2.04 & 1.72 &$-$48.5& Fe II (74)& 2.92 & \\ 4588.21 & 0.00 & 1.47 &$-$26.8& Cr II (44)& 0.00 & +2f & 6252.56 & 0.11 & 1.05 &$-$31.2& Fe I (169)& 2.02 & \\ 4589.89 & 0.00 & 1.47 &$-$56.9& Cr II (44)& 0.00 & & 6300.23 & 0.00 & 1.73 &$-$394.7& O I (1)& 0.00 & \\ 4592.09 & 2.15 & 1.29 &$-$50.3& Cr II (44)& 0.00 & & 6300.23 & 0.00 & 1.77 &$-$62.4& O I (1)& 0.00 & \\ 4618.83 & 0.00 & 1.43 &$-$39.6& Cr II (44)& 0.00 & +f & 6318.11 & 0.25 & 1.11 &$-$52.2& Ca I (53)& 2.13 & \\ 4620.51 & 0.00 & 1.40 &$-$48.7& Fe II (38)& 0.00 & & 6363.88 & 0.00 & 1.31 &$-$402.6& O I (1)& 0.00 & \\ 4629.34 & 1.41 & 1.78 &$-$46.6& Fe II (38)& 1.84 & P Cyg & 6363.88 & 0.00 & 1.26 &$-$72.6& O I (1)& 0.00 & \\ 4634.11 & 1.17 & 1.45 &$-$40.8& Cr II (44)& 2.73 & P Cyg +p & 6369.45 & 0.36 & 1.16 &$-$34.4& Fe II (40)& 2.26 & P Cyg \\ 4648.23 & 0.00 & 1.10 &$-$43.9& Fe II (38)& 0.00 & n & 6379.00 & 0.06 & 0.94 &$-$17.9& DIB & 0.75 & \\ 4656.97 & 0.45 & 1.22 &$-$44.5& Fe II (43)& 1.88 & n, P Cyg & 6393.61 & 0.18 & 1.10 &$-$36.6& Fe I (168)& 1.70 & \\ 4666.75 & 0.40 & 1.25 &$-$39.2& Fe II (37)& 1.40 & & 6400.01 & 0.13 & 1.05 &$-$42.2& Fe I (816)& 2.41 & \\ 4670.17 & 0.41 & 1.28 &$-$27.6& Fe II (25)& 1.34 & & 6407.30 & 0.17 & 1.06 &$-$47.3& Fe II (74)& 2.73 & b: \\ 4708.90 & 0.34 & 1.16 &$-$51.6& Ba II (15)& 1.96 & & 6416.91 & 0.92 & 1.37 &$-$41.6& Fe II (74)& 2.39 & b: \\ 4731.44 & 0.77 & 1.45 &$-$49.4& Fe II (43)& 1.75 & & 6432.65 & 1.80 & 1.71 &$-$43.8& Fe II (40)& 2.59 & \\ 4764.54 & 0.73 & 1.36 &$-$72.4& Ti II (48)& 2.10 & b & 6456.38 & 0.43 & 0.93 &$-$328.5&Fe II (74)& 5.62 & \\ 4779.99 & 0.56 & 1.33 &$-$41.4& Ti II (92)& 1.85 & & 6456.38 & 2.19 & 1.83 &$-$42.7& Fe II (74)& 2.60 & \\ 4798.54 & 0.28 & 1.22 &$-$42.5& Ti II (17)& 1.32 & & 6516.05 & 2.44 & 2.00 &$-$41.0& Fe II (74)& 2.48 & \\ 4805.11 & 0.58 & 1.30 &$-$41.2& Ti II (92)& 1.75 & & 6562.82 &105.00 &15.50 & $-$9.1& H I (1)& 5.91 & \\ 4824.13 & 1.07 & 1.51 &$-$45.4& Cr II (30)& 2.19 & b: & 6604.60 & 0.30 & 1.11 &$-$31.3& Sc II (19)& 2.76 & \\ 4836.22 & 0.42 & 1.23 &$-$43.4& Cr II (30)& 2.02 & & 6613.63 & 0.17 & 0.84 &$-$26.3& DIB & 0.97 & \\ 4848.24 & 0.43 & 1.23 &$-$66.2& Cr II (30)& 1.73 & b w/H$\beta$ & 6660.64 & 0.14 & 0.93 &$-$27.5& DIB & 2.69 & \\ 4861.33 & 6.58 & 0.25 &$-$423.3& H I (1)& 8.75 & & 6699.32 & 0.02 & 0.98 &$-$34.9& DIB & 0.87 & \\ 4861.33 &16.30 & 4.75 &$-$11.1& H I (1)& 3.50 & & 6717.00 & 0.00 & 1.13 &$-$451.1&S II (2)& 0.00 & \\ \hline 4876.41 & 0.83 & 1.35 &$-$50.5& Cr II (30)& 2.35 & & 6717.00 & 0.00 & 1.13 &$-$115.7&S II (2)& 0.98 & \\ 4884.57 & 0.52 & 1.24 &$-$80.5& Cr II (30)& 1.92 & & 6717.69 & 0.10 & 1.06 &$-$21.9& Ca I (3)& 2.05 & +p \\ 4899.90 & 0.33 & 1.22 &$-$22.7& Fe II (30)& 1.48 & P Cyg:, ID: & 6731.30 & 0.00 & 1.17 &$-$400.7&S II (2)& 0.00 & \\ 4911.20 & 0.54 & 1.27 &$-$45.2& Ti II (114)& 1.89 & b & 6731.30 & 0.00 & 1.29 &$-$97.1& S II (2)& 1.43 & \\ 4923.92 & 2.60 & 0.57 &$-$396.6& Fe II (42)& 5.67 & & 6828.50 & 0.15 & 1.06 &$-$51.4& C I (21)& 2.64 & ID: \\ 4923.92 & 3.44 & 2.32 &$-$40.8& Fe II (42)& 2.50 & & 7004.60 & 0.16 & 1.07 &$-$44.5& Ti I (256)& 1.81 & ID: \\ 4934.09 & 0.35 & 1.17 &$-$53.5& Ba II (1)& 2.21 & & 7155.14 & 0.00 & 1.15 &$-$86.4& Fe II (14)& 0.00 & \\ 4957.15 & 0.16 & 1.19 &$-$18.8& Ba II (10)& 0.95 & ID: & 7214.69 & 0.34 & 1.12 &$-$37.8& Fe II (30)& 2.72 & ID: \\ 4993.35 & 0.83 & 1.35 &$-$42.7& Fe II (36)& 2.92 & & 7222.39 & 0.00 & 1.20 &$-$28.7& Fe II (73)& 0.00 & c \\ 5018.43 & 3.36 & 0.59 &$-$417.9& Fe II (42)& 7.47 & & 7291.46 & 0.00 & 1.52 &$-$37.4& Ca II (1)& 0.00 & c \\ 5018.43 & 3.51 & 2.32 &$-$37.7& Fe II (42)& 2.58 & & 7307.97 & 0.00 & 1.23 &$-$27.5& Fe II (73)& 0.00 & c \\ 5031.02 & 0.25 & 1.17 &$-$42.3& Sc II (23)& 1.31 & & 7320.70 & 0.00 & 1.20 &$-$41.0& Fe II (73)& 0.00 & c \\ 5129.14 & 0.00 & 1.47 &$-$45.0& Ti II (86)& 0.00 & b & 7323.88 & 0.00 & 1.41 &$-$42.6& Ca II (1)& 0.00 & +p \\ 5146.06 & 0.16 & 1.12 &$-$39.7& O I (28)& 1.15 & & 7376.46 & 0.00 & 1.17 &$-$61.4& Fe II ()& 0.00 & +p \\ 5154.06 & 1.44 & 1.52 &$-$47.2& Ti II (70)& 3.22 & & 7462.38 & 1.14 & 1.40 &$-$42.2& Fe II (73)& 2.83 & \\ 5169.03 & 3.30 & 0.47 &$-$363.9& Fe II (42)& 5.86 & & 7533.42 & 0.34 & 1.10 &$-$53.8& Fe II (72)& 3.06 & \\ 5169.03 & 0.00 & 2.28 &$-$38.3& Fe II (42)& 0.00 & & 7698.98 & 0.00 & 0.78 &$-$42.9& K I (1)& 0.00 & +2f \\ 5172.68 & 0.00 & 1.83 &$-$60.9& Mg I (2)& 0.00 & +p & 7698.98 & 0.00 & 0.56 &$-$31.6& K I (1)& 0.00 & \\ 5183.60 & 0.00 & 1.59 &$-$40.5& Mg I (2)& 0.00 & & 7698.98 & 0.00 & 0.92 &$-$14.0& K I (1)& 0.00 & \\ 5188.70 & 0.00 & 1.47 &$-$45.1& Ti II (70)& 0.00 & & 7711.71 & 1.75 & 1.52 &$-$43.6& Fe II (73)& 3.27 & \\ 5197.57 & 2.53 & 2.13 &$-$40.4& Fe II (49)& 2.38 & & 7774.00 & 5.15 & 0.59 &$-$323.0& O I (1)&12.70 & \\ 5226.53 & 1.22 & 1.59 &$-$34.4& Ti II (70)& 2.00 & & 8327.05 & 0.15 & 1.18 &$-$47.5& Fe I (60)& 1.67 & \\ 5234.62 & 0.00 & 2.05 &$-$44.7& Fe II (49)& 1.97 & b: & 8387.78 & 0.00 & 1.27 &$-$37.5& Fe I (60)& 0.00 & b w/Pa20 \\ 5254.92 & 0.62 & 1.30 &$-$37.7& Fe II (49)& 1.92 & b & 8413.32 & 1.27 & 1.24 &$-$51.0& H I (1)& 5.89 & b: Pa19 \\ 5261.71 & 0.00 & 1.14 &$-$29.1& Ca I (22)& 1.64 & +f & 8446.35 & 0.00 & 1.96 &$-$55.7& O I (4)& 3.54 & b: \\ 5264.80 & 0.50 & 1.25 &$-$45.6& Fe II (48)& 1.88 & & 8467.26 & 1.27 & 1.26 &$-$39.3& H I (1)& 4.89 & \\ 5275.99 & 0.31 & 1.19 &$-$408.9& Fe II (49)& 1.55 & bp: & 8498.02 & 15.92 & 4.64 &$-$35.6& Ca II (2)& 4.00 & +P16 PCyg\\ 5275.99 & 1.94 & 1.83 &$-$48.3& Fe II (49)& 2.32 & & 8542.09 & 2.82 & 0.78 &$-$445.0& Ca II (2)&11.77 & +P15 PCyg\\ 5284.09 & 1.33 & 1.68 &$-$44.9& Fe II (41)& 1.89 & & 8542.09 & 18.40 & 4.56 &$-$19.0& Ca II (2)& 5.08 & \\ 5305.85 & 0.07 & 1.06 &$-$40.1& Cr II (24)& 0.90 & & 8662.14 & 2.16 & 0.85 &$-$417.7& Ca II (2)&13.39 & \\ 5316.78 & 0.99 & 0.77 &$-$378.0& Fe II (48)& 4.24 & & 8662.14 & 16.30 & 4.20 &$-$26.0& Ca II (2)& 4.93 & +P13 PCyg\\ 5316.78 & 2.80 & 2.29 &$-$53.0& Fe II (48)& 2.43 & & 8688.63 & 0.48 & 1.20 &$-$43.5& Fe I (60)& 2.38 & \\ 5362.86 & 1.77 & 1.83 &$-$45.3& Fe II (48)& 2.12 & n, PCyg & 8727.40 & 0.27 & 1.12 &$-$69.5& C I (3)& 2.22 & ID: \\ 5526.80 & 0.74 & 1.33 &$-$42.3& Sc II (31)& 2.33 & & 8750.00 & 2.00 & 1.44 &$-$34.6& Pa 12 & 5.02 & PCyg \\ 5534.86 & 1.27 & 1.61 &$-$46.1& Fe II (55)& 2.10 & & 8806.77 & 0.97 & 1.22 &$-$44.3& Mg I (7)& 4.49 & P Cyg: \\ 5577.34 & 0.79 & 7.58 & 10.8& O I (3)& 0.09 & t & 8824.22 & 0.55 & 1.16 &$-$39.8& Fe I (60)& 3.36 & \\ 5586.76 & 0.23 & 1.10 &$-$33.3& Fe I (686)& 2.35 & & 8862.79 & 1.56 & 1.43 &$-$50.4& Pa 11 & 3.49 & P Cyg\\ 5615.65 & 0.17 & 1.10 &$-$47.6& Fe I (686)& 1.84 & & 8927.36 & 1.11 & 1.14 &$-$59.8& Ca II ()& 4.03 & c \\ \hline \end{tabular} \medskip Column information: 1 -- laboratory wavelength of the line; 2~-- equivalent width in~\AA; 3~-- peak intensity in continuum units; 4~-- heliocentric radial velocity of the line peak from fitting to a Gaussian; 5~-- line identification with the multiplet number according to Coluzzi (\cite{col93}); 6~-- full-width at half maximum in~\AA; 7~-- comment. \\ Comment notation: b~-- blend; b:~-- possible blend; c~-- contaminated with telluric spectrum; n~-- noisy; t~-- telluric line; ID:~-- uncertain identification; +f~-- blend with the following line; +p~-- blend with the previous line, P~Cyg~-- the line has a P~Cyg type profile; P~Cyg:~-- weak or noisy P~Cyg type absorption. \\ Comments to table content: zeros in columns mean that the parameter cannot be measured due to noisiness or blending. Parameters of the P~Cyg type absorption components are measured separately from the emission components of the same line only in cases when the absorptions are clearly seen. Equivalent width and {\it FWHM} for double-peaked profiles (e.g., [S~{\sc ii}]~$\lambda$6717~\AA\ and $\lambda$6731~\AA). \end{table}