1:3 sub-harmonic synchronization is seen for the m* = 10 and 20 cylinders only in the periodic regime of galloping occurring at higher Re. For m *= 1, only one kink is seen in the response curve signifying transition from initial to lower branch. Two kinks
are captured for m* = 5 cylinder. For m*= 10 and 20, an additional third kink is resolved in the galloping branch that signifies
transition from quasi-periodic flow/body motion to periodic flow/body motion.