Tables below are for XLs 1 through 5. Normally players gain HP on skill values 1.0, 1.7, 2.4, 3.0, 3.7 and so on. If HP is gained at other skill values, they are highlighted as comparatively cheaper breakpoints (e.g. 0.4 Fighting). The same goes for any value granting you 2 HP ("double" breakpoint), these are highlighted more intensely. If no HP will be gained at the usual (1.0, 2.4 ...) breakpoints, the cell is left empty.
Take care that the page doesn't check if a "double" breakpoint goes after the empty cells, therefore not being as effective as the highlighting might suggest.