如何在R barplot中显示所有的x标签?

This is a basic question but I am unable to find an answer. I am generating about 9 barplots within one panel and each barplot has about 12 bars. I am providing all the 12 labels in my input but R is naming only alternate bars. This is obviously due to to some default setting in R which needs to be changed but I am unable to find it.This is a basic question but I am unable to fin