Maximum width for column in bar chart

Question

I\'m looking for a way of limiting the column width in a chart, I\'m sure this ought to be relatively easy but I cant find a way of doing it.

I\'m populating a chart fro

Answer 1

Code for adjusting starting position if anyone is stuck on it:

.attr("x", function(d, i) { return x1(d.seriesName) + (x1.rangeBand() - 100)/2 ;})

P.S. : referring answer from Lars.