[NTG-context] \setupinterlinespace questions

Hi, a) this minimal example does not work as expected. The first column is not justified correctly on top. This does not change, even when swapping small, big, medium (e.g. make 1st col medium and 2nd small). The offset stays the same regardless of the linespacing. \starttext \startcolumns[n=3] \setupinterlinespace[small] \input knuth \column \setupinterlinespace[medium] \input knuth \column \setupinterlinespace[big] \input knuth \stopcolumns \stoptext b) Is there a possibility to use relative sizes like \setupinterlinespace[2*big] (which does not work)? Best, Florian