Let’s go back the “city name” example: i.e. We now have two tables that contains city names:
•The first table contains no errors inside the city names: This is the reference table.
•The second table contains city names that might have some spelling mistakes and we want to correct these mistakes.
We’ll typically have such a graph:
As input to the 
CorrectSpelling Action, we have such a table:
All the cities from the reference table have a “heavy weight” (greater than the parameter P3) such that no attempt to “correct” them will be made.
When using a reference table, the parameters from the CorrectSpelling Action are, typically:
When using a reference table, we’ll always have:
•Parameter P4 is “Only regroup with “Heavy” Modalities”
•Parameter P5 is checked
•Parameter P6 is equal to 1