And here is the user guide:
It gives the population of each 1km square of Ireland on census night 2011. It has various buckets, but I have just looked at total population. I used the 3dscatterplot package in R which is very easy to use.
Here is my code:
scatterplot3d(cen$CENT_EAST, cen$CENT_NORTH, cen$TOT_P)
and here is the resulting plot
You can see the big cities jumping up there. It needs a lot of polish to avoid things like Cork getting swamped in the 3d projection, but that's it for now.