Alignment of region -45, 0 and 45 with current residue, right-to-left orientation. a) If region 0 is not empty, region -45 and region 45 are aligned at right with region 0 and placed on the bottom and the top of it respectively. After that, the centre of region 0 is aligned with the centre of the current residue and the three regions are placed on the left of current residue. b) If region 0 is empty and only one region between -45 and 45 contains residues, the non-empty region is placed on the corner of the current residue, on top-left or bottom-left accordingly. c) If region 0 is empty, the regions -45 and 45 are placed on the corners of the current residue (top-left or bottom-left accordingly).