Ordinate X (Date)	-	relative time of recent update of Web Site / relative time of recent update of a group of Web Sites.
Ordinate Y (Size)	-	may be the quantity of letters, pages, outside links, pictures, binaries, error links, or given keywords in the HTML pages of Web Site / a group of Web Sites.
Ordinate Z	-	item of list.
Brightness (in one-color worlds)	-	the quantity of links to the outside in the HTML pages of Web Site.