Continuous data axes
For continuous data axes centrally align labels over tick marks.
Example of how to format continuous data axes
Categorical data axes
For categorical data axes labels should be aligned between tick marks.
Example of how to format categorical data axes
Using more ticks than labels
You can use more tick marks than labels; ticks indicate the scale or level of detail of the data.
Label the final tick if there are more ticks than labels and there is space to do so.
Example of how to format ticks and labels
Economic inactivity rate for people aged 16 to 64 years
UK, January 1980 to October 2014