[NTG-context] "Padding" in natural tables

Hi,, I have been searching the documentation on natural tables (\bTABLE), but haven't been able to resolve the following issue: I would like to specify an internal padding in the table cells, e.g. text content should start 0.4cm from the left edge of the table cell. Also, it would be nice to specify the distance from the top border. (In HTML this is accomplished with the "padding" option.) The table is composed with horizontal lines only. I have tried the "distance" option for the table columns, but this gives ugly "broken" horizontal lines. What is the best solution - is there an undocumented parameter, or do I have to add a block within the cell and specify an external margin for that block? Best regards, Tommy Jensen