How to reduce or have no spaces between bars in the plot along with the reduction of width of the bar(size of each bar probably all are of same size)

I have plotted a simple bar graph having 3 bars and what should i do for having no spaces or reduce space between the bars in plot and also reduce the width at atime

i have tried bargap=0 for no space and it has reflected but if i use width=0 along with it ,at a time both are not reflected .My plot orientation is vertical