Wow. That works.
You are right, that is tricky.
What does the split latitude pill mean? I've never seen that before.
I see that something is going on with the index, but can't figure out what.
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Split Lat mean Dual Axis.
So there are two maps actually, each one with their own Marks.
Also you could see two distinct Marks shelves. Three shelves, actually.
And the Pills are different on each shelf. So are the Marks on each Pane.
The Table Calculation INDEX() Filter effectively "hides"
just one of the duplicated Marks for the Plant B (LA) --
those on the leftmost Lat pill (backmost map) Pane,
so only 4 Marks on both Panes are left (instead of 5).
And you could see the 3 Nulls (as indicated in the lower right).
So the total (potential) number of Marks would be 2 x 4 == 8.
To leave only 4 marks on a view, i've created INDEX() calculation
by typing right in the Marks shelf of those leftmost Lat green pill
(this is the upper shelf from the two). After setting the Addressing (Compute using),
I've moved the pill onto the Filters shelf and "hide" the mark with INDEX() = 3. That was it.
Hope this could help.