Examples of different types of spectral line profiles according to the number of peaks detected regardless of the noise (as in colored maps shown in the columns on the left in Figs. 5 and 6). In columns from the left, spectral profiles of Lyα, Lyβ, Mg II k, and Mg II h are shown. In rows from the top, plots of 1-, 2-, 3-, 4-peak and peculiar profiles are located. Error margins of intensities are shown as gray areas around plot-lines. On abscissas, relative wavelength scales Δλ = λ − λ₀ are used (for the λ₀ values see Table 1). The relative intensities I/I_ref are on ordinates; intensities I_ref in erg s⁻¹ cm⁻² sr⁻¹ Hz⁻¹ are shown at the top of each column for individual spectral lines. The positions of all peaks are marked with blue vertical dotted lines. For a given type of profile (row of the figure) the Lyman line profiles are not from the same position nor from the same time while Mg II k and h profiles of given type are.