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Data node is fixed and cannot be modified. Changes of the input table will not cause a recalculation. No manual recalculation is possible. No operation can be added.  See Update process between data nodes.

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Some input, i.e. a referenced node, a parent node, a TIS Table, or a TIS File, of this node has changed (maybe many steps before). By clicking this symbol, this node and all intermediate nodes are recalculated. See Update process between data nodes.

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This node is manually updated. 

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An error has occurred in one of the operations of this node. No calculation could be performed and no result table is available.

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A warning has occurred in one of the operations of this node. Possibly some calculation could still be performed.

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 This node is connected to TIS Board.

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The recalculation of this data node is triggered by an event in TIS Board.