change confidence interval line length in barplot2 (plotrix package)

Hi,

is there any way to change the width of the horizontal line of confidence intervals
in the barplot2 function in the plotrix package (independent of the width of the bars)?


example code:

library(plotrix)
# Example with confidence intervals and grid
hh <- t(VADeaths)[, 1]
mybarcol <- "gray20"
ci.l <- hh * 0.85
ci.u <- hh * 1.15
mp <- barplot2(hh, beside = TRUE,
        col = c("lightblue", "mistyrose",
                "lightcyan", "lavender"),
        legend = colnames(VADeaths), ylim = c(0, 20),
        main = "Death Rates in Virginia", font.main = 4,
        sub = "Faked 95 percent error bars", col.sub = mybarcol,
        cex.names = 1.5, plot.ci = TRUE, ci.l = ci.l, ci.u = ci.u)



thanks!