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Have you tried adjusting the ~maxUrange and ~maxRange parameters, and adjusting their relative values?

From the documentation:

~maxUrange (float, default: 80.0) The maximum usable range of the laser. A beam is cropped to this value. ~maxRange (float) The maximum range of the sensor. If regions with no obstacles within the range of the sensor should appear as free space in the map, set maxUrange < maximum range of the real sensor <= maxRange.

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