Whilst the secondary Y (value)
axis appears automatically when a data series is placed on the
secondary axis the secondary X (category) axis requires you to
enable it.
Create a standard
line chart based on the data in A1:C6
A
B
C
1
Rating
Percentage
2
One
1.0
63.5%
3
Two
2.0
64.7%
4
Three
3.0
22.4%
5
Four
4.0
17.1%
6
Five
5.0
33.1%
Select
the 2nd data series, right click and from the popup menu
choose Format Data Series...
On the format dialog choose Axis and then Plot series on
secondary axis
The
secondary Y (value) axis is displayed automatically. To
enable the secondary X (value) axis right click the
chart and from the popup menu choose Chart Options...
On the Axes tab of the Options dialog enable the
secondary Category axis