'http://otile1.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png',
'http://otile2.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png',
'http://otile3.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png',
'http://otile1.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png',
'http://otile2.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png',
'http://otile3.mqcdn.com/tiles/1.0.0/osm/${z}/${x}/${y}.png',