Hi all, I have this MWE. Now I want to draw only the subpath of S between gong6 and gong7 with a red line which is narrower at the two ends and thicker in the middle part. How to achieve this? Thanks! Emanuel \setuppapersize[A4,landscape] \starttext \startMPcode numeric u; u=1cm; %equiangular spiral numeric a, k ; a = 2.3; %scaling factor k = 8.61722335; path S; S = right for t=1 upto 360: .. a ** (t/50.2) * dir (-k*t) endfor; draw S; z1 = 8 dir -14; path A; A = origin -- z1 scaled 0.7u ; draw A; pair AEndPoint; AEndPoint = point 1 of A; pair gong[], times; numeric n; n = 0; for i = 1 upto length(A): for j = 1 upto length(S): times := subpath (i-1,i) of A intersectiontimes subpath (j-1,j) of S; if xpart times > -1: gong[incr n] = 1/2[point xpart times of subpath (i-1,i) of A, point ypart times of subpath (j-1,j) of S]; fi endfor endfor dotlabel.rt ("$gong6$", gong6); dotlabel.rt ("$gong7$", gong7); %Now I want to draw only the subpath of S between gong6 and gong7 with a red line which is narrower at the two ends and thicker in the middle part \stopMPcode \stoptext