Line parameters (top: FWHM, middle: depth, and bottom: contrast) as a function of the line central wavelength (left) and the number of lines as a function of the parameters, where the values of each order have been stacked (right) for Luyten’s star (Karmn J07274+035, M3.5 V, low v sin i). In all panels, colours correspond to different spectral orders. Lines in order-overlap regions, which are wider in the blue, are duplicated. The shaded grey areas in the left panels correspond to regions contaminated by telluric features, broadened by ±30 km s⁻¹. The black lines in the right panels correspond to the distribution of the lines in all orders.