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Short answer: I think setting both parameters to .8 would work for you.

Long answer:

For each sensor, you specify a sensor_frame and the distance from that frame to each observation is measured.

If the observation source is set to 'marking', then it will place a lethal obstacle on the costmap if that distance is less than obstacle range. Similarly, if the source is set to 'clearing' then it will mark all of the space between the sensor frame and the observation as free space if the distance is less than the raytrace range. Otherwise, it will only clear the line that is raytrace_range long (closest to the sensor).

In your particular case, you MIGHT want different values for these two parameters if for instance, you only want to mark with certainty points <800mm, but want to clear up to 1200mm (for example).