if unknown gen_sigma : readfrom("gen_sigma") fi
     
def dims = 9.5u#,x_height#,0 enddef;
def ital = 0 enddef;
def fit_params = -.25,0 enddef;
     
def gen_letter =
  pickup fine.nib;
  pi_bar;                                                       %bar
  pos4(hair,0); pos7(hair,0); y4=y7=y2;                         %attachments
  lft x4l-(x1-.5hair)=lft x7l-rt x4r=rt x3-rt x7r;
  pos5(hair,0); pos8(hair,0); y5=y8=.5x_height; x5=x4; x8=x7;   %midstems
  x6+.5stem=hround(rt x4r if not straight:-.25u fi); y6-.5stem=-oo; %left stem
  numeric slope; slope=angle((z5-z6)xscaled2); pos6(stem,slope-90);
  filldraw circ_stroke z6e...z5e---z4e;
  x9=x7+1.5u; bot y9l=-oo; pos9(stem,90); alpha_tail(9,10);     %right stem
  filldraw stroke z10e...z9e{left}...z8e---z7e;
enddef;
     
cmchar "Lowercase pi";
beginchar("p",dims);
this_letter; penlabels(1,2,3,4,5,6,7,8,9,10); endchar;
     
if boolean barebones: picture savedpicture; endinput; fi
     
cmchar "Lowercase sigma followed by pi";
begindoublechar(oct"020",dim_sigma);
mid_sigma; middoublechar(dims); this_letter; endchar;
     
picture savedpicture;