Thanks for the comments on the article.
Mole, we didn't really rate the Keela system as equivalent in performance to Paramo, it just made sense at the time of writing for the two systems to be lumped together.
I suppose I should say 'thanks' at this point to all the people on this forum who have contributed to my education in this area over the years: posters such as Captain Paranoia, John Burley, Parky, Martin Carpenter, Peter Clinch and of course Jon Doran (plus others that I've no doubt forgotten) were part of the reason why I got into this line of research! Cheers.