if unknown gen_sigma : readfrom("gen_sigma") fi
     
def dims = 8.5u#,asc_height#,desc_depth# enddef;
def ital = 0 enddef;
def fit_params = 0,0 enddef;
     
def gen_letter=
  pickup fine.nib;
  pos4(hair,-180); y4=bar_height; lft x4r=hround(.75u);         %left bulge
  pos6(hair,-180); rt x6l=hround(w-.75u); y6=-.5stem;           %bottom right
  y3+.5stem=h+o; x3+.5stem=hround(rt x6l-.25u);                 %top right
  numeric slope; slope=angle((z3-z4)xscaled 2); pos3(stem,slope+90);
  pos5(stem,-90); bot y5r=0; x5=.5w;                            %inflection pt
  pos7(vstem,-270); y6=.5[y7r,y5r]; x7-.5vstem=hround x5;
  filldraw double_circ_stroke                                   %bowl and tail
    z7e{right}...z6e{up}...z5e{left}...z4e{up}...z3e{dir slope};
  pos2(hair,slope+90); z2r=z3r;                         %where handle attaches
  pos1(curve,0); lft x1l=hround(lft x4r+.25u); y1+.5curve=h+o;  %end of handle
  filldraw circ_stroke z1e{down}...z2e{dir slope};
enddef;
     
cmchar "Lowercase zeta";
beginchar("z",dims);
this_letter; penlabels(1,2,3,4,5,6,7,8); endchar;
     
if boolean barebones: picture savedpicture; endinput; fi
     
cmchar "Lowercase sigma followed by zeta";
begindoublechar(oct"032",dim_sigma);
mid_sigma; middoublechar(dims); this_letter; endchar;
     
picture savedpicture;