'Define tab size in Word document

I would like to calculate tab size in white spaces, that is, roughly how many spaces the tab contains.

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Here is a snippet of this Open XML document:

  <w:body>
    <w:p w14:paraId="606C743E" w14:textId="78B4DBA2" w:rsidR="009322DC" w:rsidRPr="00641B97" w:rsidRDefault="00641B97" w:rsidP="00641B97">
      <w:pPr>
        <w:pStyle w:val="KNotice"/>
        <w:keepNext/>
        <w:spacing w:after="0"/>
        <w:rPr>
          <w:szCs w:val="20"/>
        </w:rPr>
      </w:pPr>
      <w:r>
        <w:rPr>
          <w:szCs w:val="20"/>
        </w:rPr>
        <w:tab/>
      </w:r>
      <w:r w:rsidR="00B846CC">
        <w:rPr>
          <w:szCs w:val="20"/>
        </w:rPr>
        <w:t>Some text.</w:t>
      </w:r>
    </w:p>
    <w:sectPr w:rsidR="009322DC" w:rsidRPr="00641B97">
      <w:pgSz w:w="12240" w:h="15840"/>
      <w:pgMar w:top="1440" w:right="1440" w:bottom="1440" w:left="1440" w:header="720" w:footer="720" w:gutter="0"/>
      <w:cols w:space="720"/>
      <w:docGrid w:linePitch="360"/>
    </w:sectPr>
  </w:body>

I will use Open XML SDK for parsing, but before, trying to find property responsible for this tab size, for example, changing <w:szCs w:val="20"/> does not affect.

I noticed that this size is changed while manipulating First Line Indent or Left Indent, hence I assume there is not some single property that stores value of tab size and maybe I have to manipulate some several properties for that.

Is there such property in document structure? Or it should be calculated in some way?



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