int mass = t->cache.num_houses / 8;
		/* Actually we are proportional to sqrt() but that's right because we are covering an area.
		 * The offsets are to make sure the radii do not decrease in size when going from the table
		 * to the calculated value.*/
		t->cache.squared_town_zone_radius[0] = mass * 15 - 40;
		t->cache.squared_town_zone_radius[1] = mass * 9 - 15;
		t->cache.squared_town_zone_radius[2] = 0;
		t->cache.squared_town_zone_radius[3] = mass * 5 - 5;
		t->cache.squared_town_zone_radius[4] = mass * 3 + 5;