Hello friends,
I am trying to setup following tutorial on cturtle:

http://www.ros.org/wiki/laser_pipeline/Tutorials/IntroductionToWorkingWithLaserScannerData

I found out that sample 'laser.bag' do not have data as mentioned in
tutorial. Laser.bag do not publishes topic '/base_scan' when played. 
Following is the output of 'rostopic list '


nitin@tangri:/opt/ros/cturtle$ rostopic list -v
Published topics:
 * /tilt_scan [sensor_msgs/LaserScan] 1 publisher
 * /rosout [roslib/Log] 2 publishers
 * /tf [tf/tfMessage] 1 publisher
 * /clock [roslib/Clock] 1 publisher
 * /my_cloud [sensor_msgs/PointCloud] 1 publisher
 * /rosout_agg [roslib/Log] 1 publisher


Although tutorial still run by changing from '/base_scan' to '/tilt_scan',
it do causes some confusion for newbees.

regards
nitin
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