How did the Roman temples adapt Ionic columns?

More slender and more ornate than the masculine Doric style, an Ionic column has scroll-shaped ornaments on the capital, which sits at the top of the column shaft. Ionic columns are said to be a more feminine response to the earlier Doric order. The ancient Roman military architect Vitruvius

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I search but can't get exact type of answer

i believe their role is to instruct certain sections on when they are to join and when they are to stop