I have the same question. How can I label the vertical axis (the series data) of a contour plot? I also want each data-series point to be depicted. Any help would be much appreciated. I understand the chart's X-axis is the horizontal axis (20, 40, 60, etc), the chart's Y-axis is the color and the 3 dimensional nature of the chart (the %s), and the Series is the 'slice' of each data series. Which would be depicted by the vertical axis below (red arrows). I want to display the points on this axis, or the series, points. How can I do this?