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Try this configuration:

observation_sources: laser_scan_sensor

laser_scan_sensor: {sensor_frame: laser, data_type: LaserScan, topic: scan, marking: true, clearing: true, expected_update_rate: 0.5}

If you are still having issues, please post the rest of your configuration file. Not a lot of info was given to figure out your issues... Also, a screenshot of RXGRAPH would be nice alongside the output of this command:

rostopic info scan

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