Who said we don't do irregular grids?

using GMT

X,Y = GMT.meshgrid(-3:6/17:3);
XX = 2*X .* Y;    YY = X.^2 .- Y.^2;
pcolor(XX,YY, reshape(repeat([1:18; 18:-1:1], 9,1), size(XX)), lc=:black, show=true)


Is this some julia black magic or native gmt?

At the end there is only a call to psxy but the Julia middle-men have the work to pave the way, but not that much

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