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Absolute (default mode): the spacing value of the repeated feature directly refers to the spacing value of the parent feature.
Relative: the spacing value of the first repeated feature refers to the spacing value of the parent feature. Every next repeated feature will refer to the spacing value of the previously created feature.
A new parameter called "Relative XXX" is aggregated under the repeated features in the specification tree (except for the first repeated feature). Therefore, every created repeated feature is created with the spacing value of the previous feature plus the "Relative XXX" value.
You can edit and modify the "Relative XXX" value. As a consequence, the repeated feature will move according to new value and further repeated features will be created or updated using this new value plus the "Relative XXX" value of the parent feature.