How to plot hourly data using GMT?

I got time series data of PWV. They are values for each hour. The data file looks like,

001 00 1.2
001 01 1.3
...
001 23 1.5
002 00 1.3
...

The resulting plot looks like,
|
| *
| -- * ---* --*-- *
| - * --*- *
|______________ *_____________
00 06 12 18 00 06 12 18
----001--- 002

Note: - in plot is blank.

How to do this in GMT?
I spent several hours working on this, but got no solution.