I would like to produce charts of phytoplankton biomass changes 
through time. Each species has a line, and the biomass varies in 
mirror form along the line for each species along the X time axis. 
Here is an example of what I'd like to do: 
http://www.er.uqam.ca/nobel/r30240/Succession.jpg

Thanks
David Bird
UQAM, Montreal

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