\begin{NiceTabular}{|wl{\ColOne}|wl{\ColTwo}|}\hline
%Line 1: Global title
\Block[c]{1-2}{\titleTable}&\\\hline
%Line 2: Title of the three columns
\Block[c]{1-1}{Definitions} &
\Block[c]{1-1}{Series} \\\hline
%Line 3: The definition and the area of the series.
\Block[l]{\value{TOneSeriesPart}-1}{%
\deflength{\MathContentSize}{\ColOne-2\tabcolsep}%
\vspace{\TOnePushDef}%
\hspace*{\TOneMoveDef}\smash{\TOneDef{\MathContentSize}}}&
\Block[c]{\value{TOneSeriesPart}-1}{%
\deflength{\MathContentSize}{\ColTwo-1\tabcolsep}%
\TOneSums{\MathContentSize}} \\
\AddBlankLines{\value{TOneSeriesPart}-2}{\TOneEmptyLine}\\\cline{2-2}
%Line 4: The title of the Identities part
\Block[c]{1-1}{} &
\Block[c]{1-1}{Identities} \\\cline{2-2}
%Line 5: The first part of the Identities
\Block[c]{\value{TOneFormulaeAPart}-1}{} &
\Block[c]{\value{TOneFormulaeAPart}-1}{%
\deflength{\MathContentSize}{\ColTwo-1\tabcolsep}%
\TOneIdentitiesA{\MathContentSize}} \\
\AddBlankLines{\value{TOneFormulaeAPart}-2}{\TOneEmptyLine}\\\cline{1-1}
%Line 6: The last part of the formula
\Block[c]{\value{TOneFormulaeBPart}-2}{%
\deflength{\MathContentSize}{\ColOne+\ColTwo-1\tabcolsep}%
\TOneIdentitiesB{\MathContentSize}%
} & \\
\AddBlankLines{\value{TOneFormulaeBPart}-2}{\TOneEmptyLine}\\\hline
\end{NiceTabular}
\endgroup
