I have a question about XY grids. The student that I work with has a very difficult time reading the grids that are in his braille math books. The grid lines are very faint and he can hardly feel them, and he has an extremely hard time following them. I have been told that the guidelines for tactile graphics state that the x- and y-axis lines are high, but the grid lines are to be kept very faint. Are the guidelines posted somewhere? Has anyone heard of other braille readers having trouble with this? Our student is an excellent braille reader and also does well with reading tactile graphics, except for these grids.