/*sib is tree C being passed by B*/
/*D is tree below etest*/
double D_AB, D_CD, D_AC, D_BD;
/*sib is tree C being passed by B*/
/*D is tree below etest*/
double D_AB, D_CD, D_AC, D_BD;
sib = siblingEdge(etest);
left = etest->head->leftEdge;
right = etest->head->rightEdge;
sib = siblingEdge(etest);
left = etest->head->leftEdge;
right = etest->head->rightEdge;