Color-color diagrams for different regions in the Original TRG. Main tail (blue), southern tail (magenta), F1 (black), F2 (green), horizontal filament (orange) are shown from top to bottom, left to right. The distance is calculated between the centers of consecutive regions, starting from a reference region (Sect. 4.4), in the left-to-right direction for the horizontal filament and in the bottom-to-top direction for all the others.