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