def single_traj_from_n_files(file_list, top):
    """ Creates a single trajectory object from a list of files

    """
    traj = None
    for ff in file_list:
        if traj is None:
            traj = md.load(ff, top=top)
        else:
            traj = traj.join(md.load(ff, top=top))

    return traj
Creates a single trajectory object from a list of files