<informaltable>

<tgroup cols="4" colsep="1" rowsep="1" align="left">

<colspec colname="c1" colwidth="2cm">

<colspec align="left" colwidth="2.5cm">

<colspec align="right" colwidth="5cm">

<colspec align="center" colwidth="3cm">

<row>

<entry>Colonne 1</entry>

<entry>Colonne 2</entry>

<entry>Colonne 3</entry>

<entry>Colonne 4</entry>

</row>

<row>

<entry align="center" valign="top">à gauche (au niveau tgroup)

</entry><entry align="center" valign="top">à gauche

</entry><entry align="center" valign="top" morerows="1">à droite

</entry><entry align="center" valign="top">cellule centrée

</entry></row>

<row>

<entry align="center" valign="top">colonne de 2 cm

</entry><entry align="center" valign="top">colonne de 2,5 cm

</entry><entry align="center" valign="top" morerows="1">colonne de 4 cm

</entry></row>

<row>

<entry align="center" valign="top">colonne de 2 cm

</entry><entry align="center" valign="top" morerows="1">colonne de 2,5 cm

</entry><entry align="center" valign="top">colonne de 4 cm

</entry></row>

<row>

<entry align="center" valign="top">colonne de 2 cm

</entry><entry align="center" valign="top">colonne de 4 cm

</entry><entry align="center" valign="top">colonne de 4 cm

</entry></row>

</tgroup>

</informaltable>