(if ``nodes'' are set as bits at #20.2, i.e. ``b'' or ``B``)
The default cell cell size was set in #7. This default can be altered by a given factor. The following prompt is presented,
alter cell size, now 4 pixels: (Value shown is an example)
Enter the new cell size in pixels. Note that the cell size is the same as for ``backwards'' space-time patterns (#17.6) and can be changed ``on the fly'' (see #25.2).