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It _looks_ like you want to take the velodyne_laserscan node and choose a different ring than the one that was chosen when the log was recorded.

You can do this by running the following commands In separate terminals:

• roscore
• rosrun veldoyne_laserscan velodyne_laserscan_node
• rosbag play my_bag.bag --topics /velodyne_points

Since you're running the velodyne_laserscan_node, you'll be able to reconfigure it and select a different ring.