gnuplot histogram: How to put values on top of bars

Question

I have the following data:

1   3215
2   321
...
31_60   59
60+   32

I would like to generate histogram using gnuplot and put the value of b

Answer 1

using 0 works well with xtic().

plot 'file.dat' using 2:xtic(1) with histogram, '' using 0:2:2 with labels