OptionaldifferentThe first page uses its own set.
OptionaldifferentEven pages use their own set.
OptionalevenOptionalevenOptionalfirstOptionalfirstOptionalignoreThe headers and footers do not line up with the page margins.
OptionalignoreThe headers and footers do not scale with the sheet.
OptionaloddOptionalodd
The headers and footers as JSON. Each header and footer is the whole string, with its section and formatting codes, as Excel stores it.