What can be done to ensure that the vertical row headers in a LaTex table fit properly?

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There are several ways to ensure that the vertical row headers in a LaTex table fit properly:

1. Adjust column width: Use the \begin{tabular}{|p{width}|...} command to specify the width of the first column.

2. Use a smaller font size: Use the \small or \footnotesize command to reduce the font size of the row headers.

3. Use a rotated header: Rotate the header 90 degrees with the \rotatebox command, which can fit sideways in narrow columns.

4. Center the text: Use the \centering command to center the text within the cell.

5. Use a multi-row header: Use the \multicolumn command to merge multiple rows, which will fit better and avoid the problem altogether.