ColLineTypes is an integer vector, whose length is normally equal to the number of columns in the Grid. Each element in ColLineTypes specifies an index into the GridLineFCol and GridLineWidth properties, thus selecting the colour and width of the vertical grid lines.

For example, if ColLineTypes[1] is 3, the first vertical grid line in the Grid is displayed using the colour specified by the 3rd element of GridLineFCol, and the width specified by the 3^rd element of GridLineWidth.

Note that ColLineTypes is not ⎕IO dependent, and the value 0 is treated the same as the value 1; both selecting the first colour and line width specified by GridLineFCol and GridLineWidth respectively.

The default value of ColLineTypes is an empty numeric vector (⍬). If so, all vertical grid lines are drawn using the first element of GridLineFCol and GridLineWidth.

A vertical grid line is drawn down the right edge of its associated column. One pixel is drawn inside the column of cells; additional pixels (if any) are drawn between that column of cells and the next one to its right.