\documentclass[11pt]{article}
\usepackage{mathptmx,pst-func,pstricks-add}
\newpsstyle{a}{linewidth=1.3pt,linecolor=blue,arrowscale=2}
\newpsstyle{b}{linewidth=0.8pt,linecolor=black,arrowscale=2,arrows=->}
\newpsstyle{c}{ticksize=0,labels=none,linewidth=0pt}
\newpsstyle{d}{fillcolor=red,linecolor=black,dotsize=5pt}
\def\psvlabel#1{\footnotesize $#1$}
\def\pshlabel#1{\footnotesize $#1$}
\psset{algebraic,arrowLW=.3pt}