How can I align X axis tickers of all subplots in a figure?

[Boris Ljevar]

Depending on the range of Y axis, X axis of different subplots can
become shorter or longer, although the X axis is common for all subplots
and always has the fixed range.

I shall try to illustrate the problem. Suppose two graphs shown below
are plotted as subplots in a figure. 

    |          |          |          |
0.8 |----------------------------------
    |          |          |          |
0.6 |----------------------------------
    |          |          |          |
0.4 |----------------------------------
____|__________|__________|__________|_
    |0         |1         |2         |3    

       |         |         |         |
-10000 |-------------------------------
       |         |         |         |
       |         |         |         |
-20000 |-------------------------------
       |         |         |         |
       |         |         |         |
-30000 |-------------------------------
_______|_________|_________|_________|_
       |0        |1        |2        |3 


Please notice that in both graphs X axis has the same range 0-3.
Please also notice that one axis is more compressed than the other.

These two graphs are places in a single figure for easier viewing and
comparison. However due to misalignment of the X axis the comparison is
difficult.

Is there a way to align the X axis values?

operating system: linux openSUSE 11.0
octave version: 3.0.2-2.1 (i586)
gnuplot version: 4.2.3-27.1 (i586)