def format_coords(coord):
    """Make a set of coordinated PDB-format ready."""
    new_x = f"{coord[0]:.3f}".rjust(7, " ")
    new_y = f"{coord[1]:.3f}".rjust(7, " ")
    new_z = f"{coord[2]:.3f}".rjust(7, " ")
    return new_x, new_y, new_z