[NTG-context] \startplacefigure equivalent of \placefigure

Hi all, I did not find the \startplacefigure equivalent of: \placefigure [high,low] % <- here are the options I need {test} {\externalfigure[pic-test]} I checked in the sources but found nothing about these 'high', 'low' options. Anybody has an idea? Thanks in advance. -- Romain Diss