Column titles in a table: singular or plural?

Question

Should column titles in a table be written in singular or plural form?

E.g. singular:

plural:

Answer 1

This is largely stylistic. Typically they would be singular. (Name, Address, etc.) However, your "Parameter name" entries have multiple parameters names, so you might show that with the headings:

| Parameter category | Parameter names |

or: (if there may be any number of parameter names)

| Parameter category | Parameter name(s) |