[ferret_users] overlays + ppl = no overlays?

[John Graybeal <graybeal@xxxxxxxxx>]

I am trying to plot multiple scatterplots on a single pair of axes, as in:

1)  plot/symbol=19/size=.2/color=blue/vlimit=0:1:0.25/nolabel upV
2)  plot/symbol=47/size=.2/color=red/vlimit=0:1:0.25/overlay/nolabel downV

This works.  Now I'd like to add custom labels, as in

3)  ppl title "Profiler Velocity (up=profiling=blue, down=return=red)"
4)  ppl plot

This also works, except...the first plotted variable (upV) has disappeared, only downV is plotted.

I am aware of the concept of set_up and have tried it in various incantations (line 1, lines 1+2), tried making line 4 an overlay plot, tried mixing up the line orders...  I haven't found a sequence in which the final plot contains both sets of data AND the labels.  

The main documentation I found said "You have to be careful about the order of the PPL commands."  So can someone help me be careful?

Earlier I set some window characteristics, if that matters (aspect, size, margins).

John

-- 
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John Graybeal   <mailto:graybeal@xxxxxxxxx>  -- 831-775-1956 
Monterey Bay Aquarium Research Institute
Marine Metadata Initiative: http://marinemetadata.org   ||  Shore Side Data System: http://www.mbari.org/ssds