[R] Change error bar length in barplot2

[Joule Madinga]

Hi,I'm new to R.I would like to make a barplot of parasite infection prevalence (with 95% confidence interval) by age group.I have 4 parasite species and 5 age-groups and the example by Marc Schwartz (barplot2) fits very well to my data.However, I would like to plot my own 95%CI (as calculated with my own data) instead of "faked 95%CI" provided in the example.How can I proceed?
Thank you in advance. Joule 

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