$(30$ points$)$ The theoretical pressure distribution over the surface of a cylinder in an inviscid, incompressible flow is given in Figure $1.$ In contrast, several real pressure distributions based on experimental measurements for different Reynolds numbers are also shown in Figure $1,$ and are compared with the theoretical inviscid flow results.

Figure $1$: Theory and experimental data

For the subcritical curve, approximate the coefficient of pressure $C_p$ such that $C_p$ follows the inviscid theory result $($flow over a cylinder$)$ from $0$ to $60,$ as well as from $300$ to $360.$ Between $60$ and $300,C_p$ takes the value of the inviscid theory result at $=60.$ Calculate the section drag coefficient for the subcritical case.