[pstricks] isotropic XY units in psmatrix?

[Michael J. Sharpe]

It appears that the interline spacing is added to whatever is 
specified in rowsep. With 10 point type, the normal interline spacing 
is 12 pt, so you could get a square node array by using, for example, 
[rowsep=24 pt,colsep=36pt]

>When I write the following
>
>     \begin{psmatrix}[rowsep=1,colsep=1]
>       \dotnode{1} & \dotnode{2} \\
>       \dotnode{4} & \dotnode{3}
>       \ncline{1}{2}
>       \ncline{3}{4}
>       \ncline{1}{4}
>       \ncline{3}{2}
>     \end{psmatrix}
>
>I obtain a rectangular node array, not a square one!
>
>Can anyone tell me why this is not square, and therfore
>how I can fix it so it will be.
>
>Thanks
>
>Blair
>
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