Hi Phil,
Yes but you need to cheat!
Make chart in normal way. Now select the range of cells with the y-values
and use Copy command; click on chart and use Paste. Now you have two
identical series. Right click on the new data series in the chart; from
popup menu use Format Data Series; on Axis tab specify Secondary Axis and on
Pattern tab specify No makers and NO line (make second series invisible)
Hope this helps
best wishes
Bernard