Click here to see the SAS code.
Click here to see the example.


Blinged Version!

There are several tricks at work here ...

Notice that the iframe image looks very nice - this is a new v9.2
feature.  Images look better in v9.2, especially when you use 
device=png (which can use >256 colors in v9.2 sas).

I use a standard "plot2" to get the axis on the right-hand side
of the graph.  And I use annotate to draw the reference lines
and simulate an "axis" along the top of the graph - the top axis
shows the points along the journey when the balloon was at the
30k, 60k, and 90k feet altitude.

I annotate a yellow line at the point where the balloon reached
its maximum altitude, and annotated "ascent>" and "descent>"
on either side of this line.

I used annotated labels at the end of the lines, rather than 
using a color legend.  I use the legend's "offset" option to
add a little extra space on the right-side of the graph, so
I have room for these annotated labels.

Also, although it looks like just 2 lines, it is actually 
4 separate line segments - that way, I can use a slightly 
different shade of color for the ascent and the descent 
leg of the balloon's trip.

This data came from the good folks at ...  NearSpaceVentures

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