Horizontal preference

The ratio of times that the algorithm tries to fit the words horizontal instead of vertical. If set to "1" vertical words will not be generated.

Relative scaling

If this parameter is set to "1", font size of the words will be directly proportional to the frequencies. If set to "0", only word ranking will be relevant for determining the font size. Setting relative scaling somewhere in the middle between 0 and 1 will produce the best results from an aesthetic point of view.