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tf tree details

After running gmapping from intel.bag, while generating the map, if I run rosrun tf view_frames, it gives me the frames.pdf. In this case, the transform is map->odom->base_link and odom->laser,the broadcasting node for map->odom is /slam_gmapping, the broadcasting node for odom->laser is /play_1479118047019813325 node, the broadcasting node for odom->base_link is /static_transform_publisher_1479118028670611586 node Please explain the tree.