protected void plotGray(SVGPlot plot,Element parent,double x,double y,double size){
  Element marker=plot.svgCircle(x,y,size * .5);
  SVGUtil.setStyle(marker,SVGConstants.CSS_FILL_PROPERTY + ":" + greycolor);
  parent.appendChild(marker);
}

protected void plotGray ( SVGPlot plot , Element parent , double x , double y , double size ) { Element marker = plot . svgCircle ( x , y , size * .5 ) ; SVGUtil . setStyle ( marker , SVGConstants . CSS_FILL_PROPERTY + ":" + greycolor ) ; parent . appendChild ( marker ) ; }
plot a replacement marker when an object is to be plotted as " disabled " , usually gray .
