The type of plot was not mentioned. If you're creating a scatter plot, it's as easy as,
scatter(Lateral, Depth, 30, 'CL', 'filled')
where the 3rd input specifies the size of the markers. scatter(x,y,sz,c)
Update If you want a rectangular image, use imagesc(x,y,C) but first you need to reshape C into a matrix with rows and columns defined by x and y. That's shown in this answer.
