1. Create the graph as normal using the appropriate Home | New Graph command
2. Click on the Axis that should be inverted in the Object Manager or Plot document.
3. Click Graph Tools | Add to Graph | Duplicate Axis.
4. Set the location for the duplicate axis and click OK. The duplicate axis is added to the graph and is linked to the original by default.
5. Click on the plot to select it.
6. Click Graph Tools | Worksheet | Display to open the worksheet that contains your plotted data.
7. In an empty column, type the header X Value and then enter the actual X values for each tick label.  These are the values that are displayed on the original axis.
8. In the next empty column, type the header X Label.
9. Click the Data Tools | Data | Transform command.
10. In the Transform equation, enter the equation E=round(1/D,2) where E is the X Label column, D is the X Value column, and 2 is the number of decimal digits in the calculated label value.
11. Click OK.

Enter the X values into column D and
use the Transform command to generate the X Label values.

13. Return to the plot window.
14. Click on the second axis to select it.
15. In the Property Manager, click on the Link Axis tab and ensure:
1. The Link axis field is set to the original axis.
2. The Link limits box is checked.
3. The Limits Y = F(X) = value is set to X.

16. Click on the Labels tab.
17. In the General section, change the Label source to From worksheet.
18. Change the Worksheet to the worksheet that has the data and labels.
19. Set the Data column to the column that contains the X Value, as defined in step 8.
20. Set the Label column to the column that contains the X Label, as calculated in steps 10-12.

The duplicate top axis now shows the 1/X labels.

Updated July 23, 2019