I need to make a combination graph with a time x-axis and two series: 3
columns at X = 1988, 1995, and 1999; and a set of X-Y points with date
(1/1/1980, etc.) as X. So far, I cannot make the columns appear on the axis
at the correct location within the time x axis, whether I use line or scatter
for my other series. The columns are just plotted equally spaced from each
other, ignoring the x-axis, or if I make sure that their x-axis is time, then
they plot as very skinny vertical lines at the correct places. Is there any
way of getting around this without using yearly averages for my x-y scatter
data?

Example:

Point data:
Date Value
1/1/1980 .5
2/5/1980 .1
5/1/1988 .6
10/7/1990 .4
12/1/1995 .1
12/1/1996 .2
3/10/1999 .3

Column data:
1988 30
1995 40
1999 70