L.2.7.3.5 Master Records - Cell Styles

The ‘master’ cell style record () ties together all the formatting (e.g. number format, font information, and fill) for a named cell style. An inside is referenced by zero- based index (not ID) (xfId) from a definition, which names a particular cell style.

<cellStyleXfs count="1">
  <xf numFmtId="0" fontId="0" fillId="0" borderId="0"/>
</cellStyleXfs>