I have made a simple heat map (two columns, twelve genes each).  The command I use is:

heatmap.2(WATVal.mtx, labRow = WATNames, col=redgreen (40), symbreaks = TRUE, tracecol="grey98", Rowv = FALSE, Colv = FALSE, dendrogram = "none", margins = c(15,25))

Where WATVal.mtx is the data matrix and WATNames is a data frame with row labels.

I would like to make the trace line thicker.  How do I go about doing this?  I have tried variations on the lwd command without success.

Thanks,
Michael


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