time axis by 30min increments

[Steve Knox <stevek@xxxxxxxxxxxxxxxxxx>]

Hi,
I'm trying to define a time axis with 30min increments as follows:
The data file "test.dat" consists of 3 lines:
1.0
2.0
3.0

yes? define axis/t="02-feb-2002l:16:00:00":"02-feb-2002:17:00:00":30\
yes? /units=minutes tax
yes? define grid/t=tax g1
yes? file/var=xx/grid=g1 myfile.dat
yes? list xx
             VARIABLE : XX
             FILENAME : test.dat
             SUBSET   : 3 points (TIME)
 02-FEB-2002 16:00:00 / 1:  1.000
 02-FEB-2002 16:30:00 / 2:  2.000
 02-FEB-2002 17:00:00 / 3:  3.000
yes? plot xx
yes? frame/file="/data/ojima/web/vemap2/test.gif"

The times area ok and the data is ok but the plot is NOT a straight line
and the time (x) axis labels are messed up.

What am I doing wrong?

Steve Knox
NREL
Colorado State University