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Creation of external variables |
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Generation of variables and assigning the "external" status for them is performed on creation/editing a fragment (model).
Only custom variable can only be external. For an external variable to affect an image or model, the user variable must be included in an expression to calculate the desired size variable or operation parameter.
To make the user variable external, select a cell in the row of this variable and invoke the External 
command from the context menu. The icon near the command name in the menu will be selected. A repeated fetch of the command will return the variable to its initial state.
