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Answering my own question for future reference:

Problem was due to syntax of the "rosservice call assemble_scans 0 10". The two arguments should instead be the starttime and endtime of the requested scans in NANOSECONDS of ROS TIME, not seconds since sim start. It was useful to run the test scripts in https://github.com/ros-perception/laser_assembler/tree/hydro-devel/test to reach this -- maybe would useful to mention the nanosecond convention on the laser_assemble tutorial wiki to clarify?

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