Signal Flow Graph .Nontouching Loops:Loops are nontouching if they do not possess any common nodes. .Forward path:is a path from an input node to an 20 output node that does not cross any nodes R(s) Y(s) more than once. 30 .Gain (Forward path or Loop):is the production of branch transmittance of a forward path or Loop.Signal Flow Graph •Nontouching Loops: Loops are nontouching if they do not possess any common nodes. •Forward path: is a path from an input node to an output node that does not cross any nodes more than once. •Gain (Forward path or Loop): is the production of branch transmittance of a forward path or Loop