Build an attached line chart from three different entities or one ?

Hello !   I'm trying to build a line chart , the result that I currently have is this one :       each chart corresponds to a specific entity with two attributes (category and sum). I'm doing the configuration below :   In each one I'm doing the same thing, I'm just changing the entity and the microflow :   Please how can I obtain an attached chart? should I use one entity with attributes : cetgory1, sum1, category2, sum2 and category3, sum3 and then populate it ? But if I do so, I will not have just an X and Y columns. Could you tell me how can I achieve this while working with the series I know that the solution must be the change of the configuration of the series within the chart. Thanks in advance.
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