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| #set up a coloring scheme using colorRampPalette | |
| red=rgb(1,0,0); green=rgb(0,1,0); blue=rgb(0,0,1); white=rgb(1,1,1) | |
| RtoWrange<-colorRampPalette(c(red, white ) ) | |
| WtoGrange<-colorRampPalette(c(white, green) ) | |
| p <- p + scale_fill_gradient2(low=RtoWrange(100), mid=WtoGrange(100), high="gray") | |
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