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An experimental support for curvelinear grid.
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nth_coord = along which coordinate value varies.
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get extreme values.
x1, y1, x2, y2 in image coordinates (0-based)
nx, ny : number of dvision in each axis
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aux_trans : a transform from the source (curved) coordinate to
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Returns the patch used to draw the background of the axes. It
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.. note::
Intended to be overridden by new projection types.
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