Dear List,

I have a richness data distributing across 20 N to 20 S latitude. (120 E-140
E longitude).


I would like to draw the richness in the north hemisphere and a regression
line in the plot
(x-axis: latitude, y-axis: richness in the north hemisphere).
The above demand is done using plot.

Then, south hemisphere richness and regression are required to be generated
using
the same y-axis above but an x-axis on the left side of the y-axis.
(The higher latitude in the south hemisphere, the left it would move)

Please kindly share how to design the south plot and regression line for
richness.
Also, please advise if any more info is in need.

Elaine

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