Hi,

I am new to R and am using quilt.plot (from fields package) to plot gas concentrations in Europe.

I am using the following code to plot my data
library(maps)
library(fields)

test = read.csv("%change 1996_2005.txt", sep="\t")
colnames(test) = c("Station", "Measurement_BaseO3", "Model_BaseO3", "Measuerment_PeakO3",
"Model_PeakO3", "Longitude", "Latitude")

quilt.plot(test$Longitude, test$Latitude, test$Model_BaseO3,
breaks = c(-50, -40, -30, -20, -10, 0, 10, 20, 30, 40, 50), col = tim.colors(10),
xlim=c(-11,25), ylim=c(40,60), zlim=c(-50, 50), xlab="Longitude", ylab="Latitude", asp=1,
main="Modelled Base Ozone")

map(add=TRUE)

It all plots beautifully, except the size of the plotted data points is far too small.  I have tried using "cex = xx" into quilt.plot() to change the size of the data points but that doesn't seem to work. Maybe I am just using this wrong?!

I was wondering if someone could help me to alter the data point size (increase it to x 3 the current size).

Thanks,

Becca

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