Dear R users

I use bwplot to plot some figures.  There are two troubles:

1. How to change the dot of the mean to a line, like the style in boxplot
2. How to hide some tick marks.  For example, I have seven tick: A, B, C, D,
E, F, G,
    but I want show four marks: A, C, E, G on the x-axis.

Thanks!

-- 
Kind Regards,
 Guanghong

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