F Allows you to select the name of the Font that you will use for the species names. The size of the characters in the species names is scaled according to the label heights you have selected in the menu, whether plotter fonts or the Hershey font are used. The horizontal and vertical Margins in centimeters. For the moment I do not allow you to specify left and right margins separately, or top and bottom margins separately. In a future release I hope to do so.
Regularization is on by default.
It will lead to a tree in which angles look very regular. You may or may not want that. Defaults to one, but if you need a physically large tree you may want to choose a larger number. You will find that variety of effects can be achieved.