Current CVs implemented include: (i) DISTANCE : distance between two atoms (ii) COM_DISTANCE: distance between center of mass of two atom groups (iii) DF_COM_DISTANCE: difference of distances between center of mass of first two atom groups and second two atom groups (iv) LCOD: linear combination of distances between pairs of atoms (v) ANGLE: angle between lines joining atoms (vi) COM_ANGLE: angle formed by center of mass of three atom groups (vii) TORSION: dihedral angles (viii) COM_TORSION: dihedral angle formed by the center of mass of four atom groups (ix) COS_OF_DIHEDRAL: sum of cosines of dihedral angles (x) SIN_OF_DIHEDRAL: sum of sines of dihedral angles (xi) PAIR_DIHEDRAL: sum of cosines of a list of angles (xii) PATTERN_DIHEDRAL: a pattern-recognizing function defined on a list of dihedral angles (xiii) R_OF_GYRATION: radius of gyration of a group of atoms (xiv) MULTI_RMSD: RMS or RMSDs of several groups of atoms with respect to a reference position (xv) N_OF_BONDS: cv for hydrogen-bonds (xvi) HANDEDNESS: for handedness of different helices (xvii) N_OF_STRUCTURES: this counts the number of structures that stay close in the sense with respect to a group of reference structures For more details on these CVs, please see the AMBER16 manual. We are continuously adding new CVs to this list. To incorporate a newly defined and tested CV for use with ABMD and other modules, please contact sagui@ncsu.edu and/or fpan3@ncsu.edu. During the coming year, we aim to release a set of quaternion-based CVs for large-scale motions of a large number of atoms.