GrammaBabs, if you look at the 1st page, the 2nd avatar posting at 5:07 shows a pic to the right where you can see there is a center seam horizontal and vertical. She cut 1 1/4" to the lft. and rt. of the vertical seam and she cut 1 1/4" above and below the horizontal seam. Be sure not to move the fabric while doing this, just move the mat around to reach if necessary. Hope this helps.