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ffmchar("equal",15,x_ht#,0); italcorr .8x_ht#*slant; x1=good.x(2u+s+noise); x2=good.x(w-2u-s+noise); x3=good.x(2u+s+noise); x4=good.x(w-2u-s+noise); y1=.3h+noise; y2=.3h+noise; y3=.8h+noise; y4=.8h+noise; draw z1--z2; draw z3--z4; labels(1,2,3,4); endchar;