[Gnuplot-info] Omit missing x-values

[Til S. <li...@li...>]

I have data like this:

1 2
2 5
3 4
5 1
6 3
7 4
9 5

How can I plot these data with monotonic ranges on the x-axis? I'd
like to get something like this:

5 X    X
4  X  X
3    X
2X
1   X
 1235679

The FAQ's par. 4.14 (specifying '?') doesn't apply here, because
this requires a pseudo-datum to be present in the source data.

Regards
Til