Autodesk 05720-017408-9641 User Guide - Page 186

12 Tracing You can modify boundaries of all intervals except the highest and the lowest, which always have the values Max Width and 0 respectively. Changing the boundary of one interval affects boundary of an adjacent interval. If you set the upper value of a boundary to be greater than the upper value of an adjacent interval, then this interval will be deleted. Intervals can also be deleted using the Delete button. You can change boundaries and delete intervals by moving are arrow symbols on the ruler. To change the interval boundary Click the line on the width table corresponding to the required interval. Click on the box in the Start or End columns in the highlighted line and change the value of upper or low interval boundary. -orDrag the appropriate arrow on width ruler. You can delete all intervals except the default one. To delete an interval from the width table Select an interval in the width ruler or from the list, and then click Delete interval. -or- 191