Elements

at -- type(Atoms)

The actual atoms

d1a, d1b, d2a, d2b -- integer

Atoms used as reference directions, d1a$>$d1b and d2a$>$d2b

I -- real(dp), dimension(3)

Moments of inertia along x,y,z axes (after reorientation)

Mtot -- real(dp)

The total mass of the body

initialised -- logical

RigidBody type