dynamic brush spacing

Hi all - how do you change the spacing on a dynamic brush in order to place the stamps closer together?

http://docs.toonboom.com/help/harmony-11/workflow-network/#CORE/Trad_Anim/005_Ink_n_Paint/046_H1_Editing_Gradients_and_Textures.html#inkandpaint_1123855371_1001356