The higher the value is the smoother the vector outline will be the lower value will make your outline more precise i.e. the outline will display all the micro movements of your hand. Its better to increase the value for the longer outlines and decrease it for the shorter outlines. You can create a vector outline without the Graphic Select Type Create Outlines from the menu. The text will become outlined and cant be edited as text (see the image below right). Now as you can see the line beneath the text has gone. The text characters now have editable paths or outlines around them - they are no longer text but vector graphics and can be edited as such.