In Fig. 8B, the correlation obtained in the previous study is also shown, indicating that the difference in the coefficient 5.04 (it was 2.9 in the previous study [5]) is seen due to the increase in the thickness of the flame zones downstream, while the exponent 0.38 is the same as that in the previous study in which the mechanism is interpreted to be based on the intrinsic instability of the flame front at high pressure.