[ms-xlsx]: Excel (. xlsx) Extensions to the Office Open xml spreadsheetml file Format

in: An unsignedInt ([XMLSCHEMA2] section 3.3.22) attribute that specifies an index to the list of the numeric formats, specified by the pivotTableServerFormats element (section 2.4.2) specified in the extension of a PivotTable ([ISO/IEC29500-1:2011] section 18.10) specified by the pivotTableReference element (section 2.4.1) in the extension of a workbook as specified in section 2.2.4.10. The value MUST be between zero and the count attribute of the CT_PivotTableServerFormats element (section 2.6.137).

bc: An ST_UnsignedIntHex ([ISO/IEC29500-1:2011] section 18.18.86) attribute that specifies the background color for the CT_PivotValueCell element (section 2.6.135) that is a parent of this element. The color is specified as a hexadecimal value in RGB space.

fc: An ST_UnsignedIntHex ([ISO/IEC29500-1:2011] section 18.18.86) attribute that specifies the foreground color for the CT_PivotValueCell element that is a parent of this element. The color is specified as a hexadecimal value in RGB space.