olemus
vesipaberi rõhtvagu, algselt traadijäljena
= the transparent line in the ribbed texture of the laid paper

näiteid
http://1.bp.blogspot.com/-pMuXWUDeNlM/VGzteWu66RI/AAAAAAAANaQ/DcgBX2N7b6o/s1600/882.JPG
https://i0.wp.com/www.ibookbinding.com/wp-content/uploads/2014/09/laid-paper-mold.jpg