Hi ALL,

        How can I differentiate the area that does not have data or the 
data is below the minimum value using color when I plot Contour chart.
        For example, my data value range is from 5.0 to 7.5, but I am 
interested in the data value from 5.5 to 7.5, so I change levels in the 
quant2plot variable. How ever, I want to differentiate  the area between 
NO data and data value below 5.5.

        My script is attached as below, please advise me to implement this 
function. 

        Thanks in advance!


z<-data.matrix(read.table('c:/3029197.txt',sep=','))
x<-1:nrow(z)
y<-1:ncol(z)
SameVal<-0
quant2plot<-c(5.5,5.9,6,6.165,6.29,6.39,6.524,6.9568,7.5)
windows(width=5.5,height=3.5)
par(mar=c(2.3,2.8,2,5),cex.main=1,cex.axis=0.7,cex.lab=1)
filled.contour(x,y,z,
        levels=quant2plot,
        key.axes=axis(4,quant2plot),
 
col=c('#8888ff','#00ff70','#00ff00','#afff00','#ffff00','#ffd700','#ffa000','#ff0000'),
        plot.title=title(main='My Title')
)


Best Regards,
WeiQiang Li

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