# What is the M-point of an orthorhombic crystal structure?

In this paper, they have plotted the band structure of orthorhombic $$\ce{CsPbI3}$$ using Wein2k. The k-path given here is Γ—X—R—Z—Γ—X—R—A—M—X, but I cannot find the M point in the orthorhombic crystal structure online.

What is the M point of an orthorhombic crystal structure? What are the coordinates?

This question has reference to my previous post on the Brilloiun zone k-path.