Step 1. Make your chart
UsersSales Users Sales
John100John100
Mary200Mary200
Josephine150Josephine150
Peter250Peter250
Irene150Irene150
Daniel180Daniel180
Claire200Claire200
James140James140
Threshold
0150
1150
Steps 2-8
UsersSales
John100
Mary200
Josephine150
Peter250
Irene150
Daniel180
Claire200
James140
Threshold
0150
1150
Step 9.
Appearance of X and Y secondary axes
Step 10
Formatting the secondary X-axis
Step 11.
Delete the secondary Y-axis