The TableMergedCell class defines a merged area of the upper-left and lower-right of a table grid. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2011 
Syntax
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Remarks
 A TableMergedCell contains member variables that define the top-left and bottom-right row and column indexes of a table grid. A TableMergedCell object can be passed as a function parameter wherever a TableMergedCell can be passed.