Marker styles are specified by the following properties:
markerA character indicating a plot marker to be place at each data point, or "none", meaning no markers should be displayed.
markeredgecolorThe color of the edge around the marker, or "auto", meaning that the edge color is the same as the face color. See Colors.
markerfacecolorThe color of the marker, or "none" to indicate that the marker should not be filled. See Colors.
markersizeA number specifying the size of the marker. The default is 1. A value of 2 is twice as large as the default, etc.
The colstyle function will parse a plot-style specification and will return the color, line, and marker values that would result.
Parse the line specification style and return the line style, color, and markers given.
In the case of an error, the string msg will return the text of the error.
© 1996–2018 John W. Eaton
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https://octave.org/doc/interpreter/Marker-Styles.html