Thanks what other options of Carbon are available as I think Vallis and the egeria densa don't like Excel. Maybe I should take the plunge and go CO2
I very much like what you have said above. And I also like the way you have put this information across. But, now I may sound patronising! Sorry if that's how it appears. Anyway, it's a lot of information for @Marcus_F to absorb. So, fire away, @Marcus_F with any questions that you may have!