- :tile_parent => "london.render.openstreetmap.org",
- :tile_siblings => [
- "toothless.openstreetmap.org",
- "trogdor.openstreetmap.org",
- "katie.openstreetmap.org",
- "konqi.openstreetmap.org",
- "ridgeback.openstreetmap.org",
- "gorynych.openstreetmap.org"
- ]