[NTG-context] Layer presets / size of type area

Hi, I setup a layer to the size of the typearea and expect the corner presets to place my figures into the corners, but \makeupwidth/height are smaller than the typearea (same with \textwidth). Why? Hraban \setuplayout[ width=120mm, backspace=16mm, height=192mm, topspace=6mm, header=8mm, footer=6mm, ] \showframe \definelayer [TA] [x=16mm, y=14mm, width=\makeupwidth, height=\makeupheight] \setupbackgrounds[page][background=TA] \def\Square{\framed[width=1cm,height=1cm]{S}} \starttext \strut \setlayer[TA][preset=leftbottom]{\Square} \setlayer[TA][preset=rightbottom]{\Square} \setlayer[TA][preset=lefttop]{\Square} \setlayer[TA][preset=righttop]{\Square} \stoptext