xm:f: An f element (section 2.4.3) that specifies the date range for the sparkline group. The syntax, as specified in section 2.2.2, for this f element is the following:
sparklinegroup-formula = single-sheet-area / [single-sheet-prefix / book-prefix] name
Additionally, if a single-sheet-area is specified, that single-sheet-area MUST contain cells from either a single row (2) or a single column (2).
sparklines: A CT_Sparklines element (section 2.6.8) that specifies properties for individual sparklines.
Attributes:
manualMax: A double ([XMLSCHEMA2] section 3.2.5) attribute that specifies the maximum for the vertical axis that is shared across all sparklines in this sparkline group. This attribute MUST NOT exist if maxAxisType does not equal "custom".
manualMin: A double attribute that specifies the minimum for the vertical axis that is shared across all sparklines in this sparkline group. This attribute MUST NOT exist if minAxisType does not equal "custom".
