Eyes wide, mere millimeters of teeth unveiled beneath his sharp nose — there was some question whether it was even a smile. (si.com)
During coarse phasing, engineers point the telescope toward a bright star and use NIRCam to find any large offsets between the mirror segments (though «large» is relative, and in this case it means mere millimeters). (sciencedaily.com)
The natural pace of sinking — scientists call it subsidence — would have been mere millimeters per year. (scientificamerican.com)