Since the spatial resolution of SPECT is roughly equivalent to the thickness of the heart chamber wall, it can only detect those infarcts that have traversed a good portion of the chamber wall.

BBC: Dr Robert Judd

This is equivalent to the apparent thickness of a human hair seen from two kilometres away.

ECONOMIST: A roadmap for planet-hunting

The AgeDefy Advanced Thickening Treatment increases the thickness of each strand by about 5%, Dr. Thomas says, with the equivalent effect of an additional 6, 500 hairs on your head.

WSJ: Old Hair Days: Products to Help Manage Gray and Thinning Hair