[Gnuplot-info] rowstack with 2 columns per entry

[mkn86 <m.k...@gm...>]

Hi!

I need to plot a bar chart as a rowstacked histogram.
The first picture "histo1.jpg" shows the diagram without rowstacking.
http://old.nabble.com/file/p28933153/histo1.jpg 
My problem now is that I want the red bar on top of the green bar
(sequential read + random read). So in sum, I will have for each data set
(1mio, 2mio, ..., 31mio) two bar charts, namely a rowstacked one (green +
red) and the blue one.
Therefore I run this commands:
set title "Query 1 - BSBM"
set style data histogram
set boxwidth 0.75 absolute
set style histogram rowstacked
set style fill solid 1.0 border lt -1
set yrange [0:300]
set ylabel "Number of disk page reads"
plot "query1.dat" using 2 t "sequential read", "" using 3 t "random read",
"" using 4:xtic(1) t "our approach"

which delivers me this:
http://old.nabble.com/file/p28933153/histo2.jpg 
Unfortunately the blue bar (our approach) is also stacked up. Does someone
know how I can have two bars per dataset? 
Thanks a lot in advance for any help!

Cheers

P.S.
the dat file looks like this:
#	sequential page	random page	our model
1mio		6	67	38
2mio		6	102	54
5mio		8	100	54
10mio	4	104	54
31mio	12	120	54
-- 
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