def METHOD_NAME():
    for y in range(GalacticUnicorn.HEIGHT):
        for x in range(GalacticUnicorn.WIDTH):
            value = heat[x + 1][y]
            if value < 0.15:
                graphics.set_pen(fire_colours[0])
            elif value < 0.25:
                graphics.set_pen(fire_colours[1])
            elif value < 0.35:
                graphics.set_pen(fire_colours[2])
            elif value < 0.45:
                graphics.set_pen(fire_colours[3])
            else:
                graphics.set_pen(fire_colours[4])
            graphics.pixel(x, y)
    gu.update(graphics)