font style and size in QString

[uz_qt]

Hi,

How can I make the font style bold in the QString? I have written the following lines:

QString color;
	  QString text;
	  QString fonttemplate0 = QString(tr("<font color='yellow'>Magnitude: %1").arg(0));
	  d_mrk->setLabel(fonttemplate0.arg(color, text) );//d_mrk is a plot marker

QString color;
	  QString text;
	  QString fonttemplate0 = QString(tr("<font color='yellow'>Magnitude: %1").arg(0));
	  d_mrk->setLabel(fonttemplate0.arg(color, text) );//d_mrk is a plot marker

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What line should be added in tr() so as to make the font style bold and also set the font size to 10pt?