(a) The bond angle 〈θ〉 variation along a chain bond i with identical action radius R = 3 and chain monomer number N = 100, where five curves for different chain stiffness are illustrated for comparisons. (b) Results with identical chain stiffness parameter b = 70 and different monomer number N = 50, 100, and 200 from the top to the bottom. Each plot has three curves corresponding to the different cylinder radius R = 2, 3, and 4.