This is a fix for one of the equations see http://www.archivist.info/apt/aptos/apt360/doc/manual/tabcyl_kw.html#tabcyl_twopt I have re created the diagram with an online LaTex image creator http://codecogs.com/latex/eqneditor.php to fix the x1 typo any latex gurus know how to shift the lower line to the right? This being my first ever attempt at LaTex \underline{\textrm{STAB}}=\textrm{TABCYL}/\textrm{NOZ},\textrm{TWOPT},\begin{bmatrix} \textrm{TRFORM}, & \textrm{SMATRIX},\end{bmatrix} x_{1},y_{1},\\ \; \; \begin{bmatrix}\begin{cases} & \text{ SLOPE },s_{1} \\ & \text{ NORMAL },n_{1} \end{cases} , \end{bmatrix}x_{2},y_{2}, \begin{bmatrix}\begin{cases} & \text{ SLOPE },s_{2} \\ & \text{ NORMAL },n_{2} \end{cases} , \end{bmatrix}... x_{n},y_{n}, \begin{bmatrix}\begin{cases} & \text{ SLOPE },s_{n} \\ & \text{ NORMAL },n_{n} \end{cases} \end{bmatrix} Dave Caroline