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Sub-option PAN

This option permits the user to move the current window in discrete steps in any direction over the grid, that is, to display, at the same level of magnification, a portion of the grid adjacent to that currently being displayed. This can be used, for instance, to tour a boundary at a high level of magnification. After choosing PAN, the user is prompted to indicate with the mouse where the centre of the new window is to be placed.

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