Hi jcl, and thanks for replying.

I am skeptical about the money-making prowess of Luxor as well. Please note that I am trying to replicate the results pre any optimisation stage. I undertook this purely as a programming exercise - the idea being that, if I cannot manage a system as simple as this one, there is probably no point in continuing. You got similar results to the book so it would be fantastic if you did manage to find your original script if that is not too much bother.

Also, I agree on the quality of the Jaekle and Tomasini book; would you know about any other comparable books at a similar or higher technical level?

Many thanks.