[Xy-pic] Running on Linux

[Tigran Sarukhanyan]

Hello everybody,I've tried to run following tex code on Windows and it's worked properly. When I try to run it on linux, curves doesn't appear as it is shown in attached pdf file.-------------------------------------------------------------------------------------
\documentclass[12pt]{article}
\usepackage[all,dvips,arc,curve,color,frame,ps,graph]{xy}

\begin{document}
\[ \fbox{ \xygraph{
!{<0cm,0cm>;<1.5cm,0cm>:<0cm,1.2cm>::}
!{(0,0) }*+{\bullet_{a}}="a"
!{(1,1) }*+{\bullet_{b}}="b"
!{(2.5,0.5) }*+{\bullet_{c}}="c"
!{(3,-1)}*+{\bullet_{d}}="d"
"a"-"b" "a"-"d"
"b"-"c" ^{e_1}
"b"-@/_/"d" ^{e_2}
"b"-@/^/"d" ^{e_3}
"b"-@/^2cm/"d" ^{e_4}
} } \]
\end{document}----------------------------------------------------------------------------------Could you tell me what is wrong.Thanks.   		 	   		  
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