How to set space between the groups in the bar graph in Proc sgplot - gspace =3 giving error

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title " ";
ods listing style=listing;
ods graphics / width=5in height=2.81in;
ods graphics / reset=ALL outputfmt=PNG imagename="ByDilution";

proc sgplot data=main_subset PCTLEVEL=GRAPH;
vbar Sample_name / response = Ref_recovery_ group=replicate gspace=3 groupdisplay = cluster nooutline
stat=mean dataskin=pressed;
xaxis display=(nolabel noticks) discreteorder=data FITPOLICY=STAGGER;
yaxis label="% Targeted Coverage";

error..

keylegend /title='' noborder autooutline;
run;

[ballardw · Accepted solution]

Barwidth=

Clusterwidth=

0 to 1, default is .8 . A ratio of available space . Smaller means the bar is narrower and more space between bars, larger less space

No gspace option on vbar for Sgplot or Sgpanel. Proc Chart and GCHART options are generally not usable with other procedures.

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Thank you so much Clusterwidth is the one I am looking for.