This utility computes two-dimensional mean square displacement in
membrane-like systems and the lateral diffusion coefficients. It works
essentially as diffus utility with a few exceptions:
- parameter
IRT = <int.value>
defines type of ``lipid'' molecules (that is molecules which build the membrane)
- if parameter
LCOM = .true.
is defined, then MSD of lipids are computed relative to the center-of mass motion of each monolayer.
- in definition of lateral diffusion, factor 1/4 is used instead of 1/6 in 3D-diffusion.