In order to check the adequacy between the different char characteristics, an attempt was made to link the chemical composition to the structural properties. Figure \ref{102460} shows that  the ratio IV/ID is well correlated to the logarithm of the atomic  ratio. Such result was not evidenced previously in the literature. It indicates that the formation of condensed aromatic structures starting from small ones is highly correlated to the departure of H and O atoms which can exist on these structures. Therefore, char ordering is proven to have an intimal link with the presence of H and O atoms. In this present work, an equation is well established to associate the chemical composition to IV/ID ratio.