Dear All,
I would like to ask a question on how to do overlay plots in each subgraph of xyplot.
1.  I did simulations for m=1000, 2500, 5000, 10000, as the sample sizes.
2. for each sample size value m,  4 graphs are generated; each graph contains overlayed comparisons between 4 methods,
3.  now I want put them into a 4-by-4  plot by xyplot, i.e.,  4 sample size values, each of which has 4 plots.

I know how to do this using plot, but the spaces between subplots are big.

I do not know how to make each subplot in xyplot an overlayed one as it would appear using plot.

Any help would be appreciated!

Thank you,
Chee


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