Properties in this group control the appearance of trace markers (but see also the
Bar graph: Trace group property group).
Sets the size of the markers (see
traceProperties) in pixels. Supply an integer value that is between 1 and 18, inclusive.
Sets the scale mode for trace marks. Select one of the following from the drop down menu:
Scale by Trace: Scale marks according to the trace in which they reside, that is, marks in the first trace are the largest, across all traces, and the marks in the last trace are the smallest.