[R] subplot strange behavoir

[emorway]

Hello Greg,

Session info is below.  Running Win7 64-bit.  I just upgraded my version of
R and tried rerunning the code and got the same odd result.  I, too, get an
expected result when I create the plot in the R GUI.  The problem crops up
only when I try and create the plot in png() or tiff().  Perhaps I need to
try par(new=T), or some other trick-of-the-trade?  If you're unable to
recreate the problem, I suppose this is nearly a dead-end?

sessionInfo()
R version 2.13.2 (2011-09-30)
Platform: x86_64-pc-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United
States.1252   
[3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] splines   stats     graphics  grDevices utils     datasets  methods  
base     

other attached packages:
[1] TeachingDemos_2.7 Hmisc_3.8-3       survival_2.36-9  

loaded via a namespace (and not attached):
[1] cluster_1.14.0  grid_2.13.2     lattice_0.19-33 tools_2.13.2   


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