[NTG-context] strange text/math spacing

Hi, I found a small but annoying thing about math. When I typeset in-line formula like '...a vector of $a_x$ is...', it creates too little space between 'of' and succeeding lowercase math symbol.Uppercase math symbol is treated right. I can leave it as it is, but it strange to me why TeX performs poor on that. (There too many 'of' for testing purposes). %%%%%%%%%%%%%%%%%%%% \starttext In MATLAB, we can create the Leslie matrix using {\tt gallery('leslie', A, B)} command, where of $A$ is a vector of $a_x$ with dimensions of $[1:X]$ and of $B$ is a vector of \mathematics{b_x} with dimensions of $[1:X-1]$. \stoptext %%%%%%%%%%%%%%%%%%%% Best, Vyatcheslav