output.tag.set_property("W", w);
output.tag.set_property("H", h);
output.append_tag();
output.tag.set_property("W", w);
output.tag.set_property("H", h);
output.append_tag();
output.tag.set_property("X", config.points.values[i]->freq);
output.tag.set_property("Y", config.points.values[i]->value);
output.append_tag();
output.tag.set_property("X", config.points.values[i]->freq);
output.tag.set_property("Y", config.points.values[i]->value);
output.append_tag();