Continuous thick (red) diagram corresponds to an emission
coming from the innermost stable orbit (6m in the Schwarzschild case,
1.23m in the Kerr case) up to 100m;
continuous thin (green), continuous spotted (cyan) and
dashed (magenta) diagrams correspond to progressively further
areas of the disk, obtained through dividing the previous range into
three (see also part 2 for explanation).
