The only mark on the silky surface was a series of thin black lines forming several arches. (candidmagazine.com)
Bold, open squares and thin black lines divide the two - column page layout. (hloom.com)
In addition to color, speed is contoured with thin black lines at 1000 m / yr intervals and with thin white lines at 200, 400, 600, and 800 m / yr. (skepticalscience.com)