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The Lidar's laserscan/ranges work in this way:

It detects and record in terms of an array in a string of Float32.

So in the lets say the object is 2 meters between the Lidar 0 degree to 3 degree:

Range: [2.0 2.0 2.0 0.0 0.0 0.0 ....]

More on: http://docs.ros.org/en/api/sensor_msgs/html/msg/LaserScan.html

Hope it helps.

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