cutting barplots at e.g. 50%

hi,
i want to plot percentage values using barplot. everything works fine so 
far. giving a chance level of 50% i want to plot only the area above 50 
percent.
i can of course cut  using  ylim=c(50,100) but this does not work 
properly since i also see some of the area below 50%.

thanks for suggestions,
jan


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