从网页里复制图分辨率太低了,根本达不到论文要求

,怎么得到矢量图?
我画图的代码如下:
Data Germ;
Input X1 X2 X3 Y @@;
Cards;
-1 -1 0 13.20
-1 1 0 13.45
1 -1 0 12.52
1 1 0 13.30
0 -1 -1 10.13
0 -1 1 16.69
0 1 -1 12.74
0 1 1 15.68
-1 0 -1 9.74
1 0 -1 9.34
-1 0 1 15.28
1 0 1 14.26
0 0 0 16.30
0 0 0 16.56
0 0 0 16.81
;
Proc rsreg data=Germ;
Model Y = X1-X3 / lackfit;
Run;
data grid;
do;
Y = . ;
X3 =0;
do X1 = -1 to 1 by 0.05;
do X2 = -1 to 1by 0.05;
output;
end;
end;
end;
data grid;
set Germ grid;
run;
proc rsreg data=grid out=predict noprint;
model Y = X1-X3 / predict;
run;
data plot;
set predict(firstobs=16);
proc g3d data=plot;
plot X1*X2=Y / rotate=45 tilt=85 yticknum=5 xticknum=5 zticknum=5
zmin=12 zmax=17 ctop=red cbottom=blue caxis=black;
run;
Proc Gcontour data=plot;
Plot X1*X2=Y / yticknum=5 xticknum=5 nlevels=10 caxis=black
vaxis=axis haxis=axis legend=legend autolabel;
axis value=(height=13pt) label=(height=13pt);
legend value=(height=10pt) label=(height=10pt);
Run;