Irregular grids in NCL

I'm trying to draw a simple landmask using NCL.

First on a regular grid - it works fine.
Some images (attached):

1. Plot of grid's nodes (plot of geographic coordinates): grid_reg.png
2. Result: land_reg.png
3. NCL script: land_reg.ncl

Then I'm doing the same on a second grid. The second grid covers the same area,
but is more dense and irregular. Zoom of upper left corner:

4. Zoom of upper left corner: grid_var_zoom.png

As seen on the image, nodes are irregularily spaced, but still this grid is
a cartesian product of 1D grids. The effect:

5. Result: land_var.png
6. NCL script: land_var.ncl

It seems sfXArray and sfYArray options are ignored - the data is plotted just
like the spaces between the nodes where the same. Is it possible to draw plots
on such grids in NCL?

-- 
With best regards,
Szymon Jaranowski

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• application/octet-stream attachment: land_reg.ncl

• application/octet-stream attachment: land_var.ncl