[R] 3 dimensional histogram

[Gunther Höning]

Dear list,

I want to plot a "3 dimensional histogram" and  I am looking for a funktion
to do so.
I have a dataframe with the following information:

	<1	<0.5	<0	<-0.5	<-1
"a"	13	11	6	2	1	
"b"	9	8	6	5	3	
"c"	5	4	3	2	1
"d"	8	4	3	1	0

The first column is the name, the other columns are the amounts under a
certain threshold. 
First row are the thresholds.

Can anybody help me ?

Gunther