How to remove the vertical lines from the error bars?

Hi R community,
Please, I need your help. I want to remove the vertical lines (please see attached --example image) from the error bars. How can I remove it, using ggplot2 ? For error bars, I am using-- "stat_summary( = mean_se, geom = "errorbar", lwd=0.35, lty=1, width = 0.2)"

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