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Thanks again folks for the kudos, they are much appreciated and such encouragement keeps me going on these time and labour intensive projects.

Robert, I like the second example better, more realistic IMHO. One thing though if it's possible, the smoke needs to linger in the air longer and rise up higher as it does so.

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Three RFC Brass Hats were strolling down a street in London. Two walked into a bar, the third one ducked.
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Former Cold War Warrior, USAF Security Service 1974-1978, E-4, Morse Systems Intercept, England, Europe, and points above.
"pippy-pahpah-pippy pah-pip-pah"