sorry, typo:
> heatmap.2(x,col=colorRampPalette(c("blue","lightblue","darkgray","darkgray","yellow","red"),space="Lab"),at=c(-6.01,6.01,51))
> heatmap.2(x,col=c("blue","lightblue","darkgray","black","darkgray","yellow","red"),at=-3:3*2)
should be read as
heatmap.2(x,col=colorRampPalette(c("blue","lightblue","darkgray","darkgray","yellow","red")),breaks=seq(-6.01,6.01,length.out=51))
heatmap.2(x,col=c("blue","lightblue","darkgray","darkgray","yellow","red"),breaks=-3:3*2)
"at" from stats:heatmap became "breaks" in gplots:heatmap.2
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