Fixed typo

src/make_cut.f90

@@ -329,6 +329,7 @@ zmean=0.d0
 do i=1,params%mpe
   zmean=zmean+z(icon(i))*params%vex
 enddo
+zmean=zmean/params%mpe
 
 select case (matrule)
 case (1)                                                                        ! Assign material properties of volumetric majority material