load(draw);
draw2d(terminal=svg,file_name="Tripling_oriented",
  color=black,font="Times",font_size=15,nticks=75,proportional_axes=none,
  user_preamble="set termoption enhanced; set mxtics; set mytics;set key at 5.5,7",
  xtics_axis=false,ytics_axis=false,grid=true,points_joined=true,
  xaxis=true,yaxis=true,axis_top=true,axis_bottom=true,axis_left=true,axis_right=true,
  line_width=1,/*label(["x",1.,0.1],["y",0.1,1.]),*/xlabel="x",ylabel="y",
  color=red,key="",explicit(sqrt(x^3-3*x^2-6*x-3),x,-3,100),
  explicit(-sqrt(x^3-3*x^2-6*x-3),x,-3,100)
 );