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Hi, normaly the TF (or as you called it frame_id think ;-) ) for a laser scan message is by default "/laser" and the topic name is "/scan". With

rostopic list

you can check if the topic name "/scan" is available. If yes the just check by

rostopic echo /scan

if the header of the message contains the correct default frame_id. Alternatively you can also try

roswtf

and check the results.

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