fddf3d51_S5__7_0__Object_Model_JS__Cell__Property
[Type] Measurement Unit (Number or String) (range: 0 - 8640) [Access] r/w [Description] The space between the baseline of the text and the top inset of the frame or cell. [Property] 
minimumFirstBaselineOffset
Adobe InDesign CS5 (7.0) Object Model JS: Cell
Property