*
* @param spaceAfter the vertical white space after the paragraph.
*/
public void setSpaceAfter(double spaceAfter){
CTTextParagraphProperties pr = _p.isSetPPr() ? _p.getPPr() : _p.addNewPPr();
CTTextSpacing spc = CTTextSpacing.Factory.newInstance();
if(spaceAfter >= 0) spc.addNewSpcPct().setVal((int)(spaceAfter*1000));
else spc.addNewSpcPts().setVal((int)(-spaceAfter*100));
pr.setSpcAft(spc);
}