Create calculated field
It is possible to concatenate a given value with a static text by using a calculated field. For example to concatenate the temperature with "°C".
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Right click on a field in the field list (for example on the field Temperature for growth) and choose "Add calculated field".
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On the newly created calculated field, right click and select "Edit expression".
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Add (for example) the following code: Concat([Temperature for growth (°C)], '°C' )
Then click OK.
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Drag the calculated field to the label (the same way it is done for normal fields).