I think the problem is with your use of intervals and samples. Using 
method 3, intervals should always be 1 while only the first parameter of 
samples is read by the program. The second one is ignored.

Replace:

           samples 1,1
           intervals 3

by:

           samples 100
           intervals 1

You may need to play with the emission value and the multiplicator for 
the scattering value.

Thomas

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