load(draw);
draw2d( terminal=svg,
        grid=true,user_preamble="set zeroaxis; set mxtics; set mytics;",
        xtics_axis=true,ytics_axis=true,ip_grid=[100,100],
        color=blue,label(["x",1,0.1]),label(["y",.1,1]),
        xaxis_type=solid,yaxis_type=solid,line_width=1.5,
        axis_bottom=false,axis_top=false,axis_right=false,axis_left=false,
        color=red,implicit(abs(x)^0.5+abs(y)^0.5=1,x,-1,1,y,-1,1)
        );