Just to finish, a little word on efficiency for Chuck. In your haste to come and beat me about the head I think you tripped up over the meaning of the word efficiency. Do you mix it up with “imprecise”? Efficiency is just a measure of the conversion of an input into an output. Think "miles per gallon" in car terms.
I am sorry you have taken my comments as an effort to " beat you about the head " VOD80.
You will note I prefaced my first post with the statement I hesitated to enter this discussion.
I apologize for having done so as my first feelings about your attitude was correct, you did not start this discussion to learn, you already seem to know it all.