This is the actual ROOT code.

{

Eventiterator *it = new testEventiterator();

Event *e = it->getNextEvent();

PHCompositeNode *mainnode = new PHCompositeNode("MAIN");

PHNode *rnode = new PHDataNode<Event>(e,"RAW");

mainnode->addNode(rnode);

AnalyzeRaw (mainnode, h1);

PHCompositeNode *tobemixed = new PHCompositeNode("MMAIN");

e = it->getNextEvent();

PHNode *e1node = new PHDataNode<Event>(e,"E1");

tobemixed->addNode(e1node);

e = it->getNextEvent();

e1node = new PHDataNode<Event>(e,"E2");

tobemixed->addNode(e1node);

MixEvents (tobemixed);

AnalyzeRaw (tobemixed,h2);

}

Make the top node with “RAW”

Make a top node with “E1”, “E2”

Analyze, fill h1

Add RAW by mixing E1+E2

Analyze, fill h2