Thanks, good explanation.

I changed pretrace_end from 0.015 to 0.010.

I increased count from 400 to 1500.
And I added low_error_factor 0.5.
After some experimenting with each of these three measurements and
combinations of them, the entire radiosity block looks now like this:

 #if(MyRadiosity)
  radiosity
  {
   media on
   pretrace_start 0.08
   pretrace_end   0.001
   count 400
   error_bound 0.75
   recursion_limit 1
  }
 #end

pretrace_end 0.001 did the job.   :-D

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