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tokens: to all disc particles and obtained f x , f y , f z , and f R , which are frequencies of oscillations along x , y , and z coordinates and cylindrical radius R . In Fig. 1 xy , xz , and yz snapshots for the whole BL model are presented at the time moment t = 450. A barlens is clearly seen in the xy snapshot, while a thick B/P structure is visible in the xz view. Fig. 1. Face-on, side-on, and end-on views of the considered model at t = 450 (6 Gyr). 3. Edge-on structure In Smirnov et al. (2021) , the BL model was disassembled into several orbital groups to analyse the face-on morphology of an overall bar. We assume that each individual group is characterised by a unique set of frequency ratios f R / f x and f R / f y . In Smirnov et al. (2021) , we focus on the face-on morphology of the inner parts of bars in our models. For this purpose, at the initial stage of our orbital analysis, we discarded orbits from the rest of the disc (outside the ring at the co-rotation radius (CR) R c ≈ 3) as well as of the thin part of the bar itself. Orbits from the thin part of a bar are located inside the CR and can be distinguished by the frequency ratio f z / f x > 2.25 ( Smirnov et al. 2021 ). Although the fraction of the 4 kk particles in these orbits is about 14%, all these orbits do not contribute to the thick B/P bulge, but only to the most remote and vertically thin parts of the bar (see Fig. 2 ). For the thick part of the bar, we identified all separate orbital groups (see Fig. 3 ) based on frequency ratios f x / f R and f y / f R and show that the structures to which they contribute are completely different in morphology. In this Letter, we analyse the edge-on morphology of the thick bar and its components in our BL model. Fig. 2. Side-on views of particles in the considered model at t = 450 (6 Gyr). Left : vertically thick part of the bar. Middle : all particles inside the co-rotation. Right : remaining particles which form a vertically thin structure. Fig. 3. Distribution of all orbits in the bar over the ratios of dominant frequencies f x / f R and f y / f R for the considered model at t = 450 (6 Gyr). The annotations illustrate the separation of orbits into orbital groups. Smirnov et al. (2021) identified the following components constituting a complex bar with a barlens: a ‘classic’ elongated bar ( f R / f x = 2.0 ± 0.1, 21.8% of particles from 4 kk) and two components contributing to the barlens (bl u orbits, in our notation, with f R / f x ≤ 1.9, 9.2%, and bl o orbits, with f R / f x ≥ 2.1, 13.5%). A ‘classic’ bar can be further divided into two subsystems. One is assembled from the x 1-like orbits ( f y / f x = 1.0 ± 0.1, 11.4%), and another one is the so-called boxy bar with orbits that are characterised by the ratio f y / f x ≥ 1.1 (10.4%). In Fig. 3 , all these orbital groups occupy separate regions (a spot and straight rays) and can be easily distinguished. The x 1-like bar has a complex structure itself. Three main orbital blocks, which