A further option is offered in the #19.5 prompt window, to select the minimum right border width. This is entered as a percentage of the current x-spacing. If the distance between the centre of the next basin and the right border is less than this setting, the basin will be drawn at the start of the next row. Negative values for the right border are legal. The following prompt is presented,
select right border as % of x spacing (default 50.0): (values shown are examples)