I found the solution. Highlighted in bold:
<x:ExcelWorkbook>
<x:ExcelWorksheets>
<x:ExcelWorksheet>
<x:WorksheetOptions>
<x:DisplayPageBreak/>
<x:FitToPage/>
<x:Print>
<x:FitWidth>1</x:FitWidth>
<x:FitHeight>1000</x:FitHeight>
<x:ValidPrinterInfo/>
<x:VerticalResolution>0</x:VerticalResolution>
</x:Print>
<x:Selected/>
<x:FreezePanes/>
<x:FrozenNoSplit/>
<x:SplitHorizontal>1</x:SplitHorizontal>
<x:TopRowBottomPane>1</x:TopRowBottomPane>
<x:ActivePane>2</x:ActivePane>
<x:Panes>
<x:Pane>
<x:Number>3</x:Number>
</x:Pane>
<x:Pane>
<x:Number>2</x:Number>
</x:Pane>
</x:Panes>
<x:DisplayZeros/>
<x:DisplayHeadings/>
<x:DisplayOutline/>
</x:WorksheetOptions>
</x:ExcelWorksheet>
</x:ExcelWorksheets>
http://www2.sas.com/proceedings/sugi30/092-30.pdf