A surface seen from the top, a contour: a grid of a column per category and a row per series, the surface through its values colored by band. The group draws its axes; the chart's axes are laid out (their scale) and draw nothing.
Below the grid, a label at each category.
A 3-D surface, which Excel draws in perspective, drawn flat from above.
In px.
Right of the grid, a label at each series.
The bands are lines, not fills.
A surface seen from the top, a contour: a grid of a column per category and a row per series, the surface through its values colored by band. The group draws its axes; the chart's axes are laid out (their scale) and draw nothing.