Classes of Stokes V profiles of Fe i 630.15 nm (left) and Fe i 630.25 nm (right) in the quiet Sun according to a single k-means classification run. All the classes retrieved by the analysis are reported. Each panel contains the average (solid lines) and the standard deviation (colored error bars) of all profiles in the class. The dotted vertical line separates the two spectral lines (it divides the x-axis in two windows of 40 pixels, see Sect. 3.1). Each plot is represented in the same x − y range, i.e., the one of class 30. The number of the class is specified in each plot together with the percentages of profiles in the class. The colors group classes in families of alike profiles (Sect. 4): network (purple), blue-lobe (blue), red-lobe (red), Q-like (sky-blue), asymmetric (green), antisymmetric (yellow), and fake (orange).