Hi I'm just starting off with R but is this correct?

I have this data set.
> data
   Type     ID Size
1  Reqd 244808 1024
2  Reqd 244045  512
3  Reqd 245427  800
4  Reqd 245423 1024
5  Reqd 244983 1024
6  Used 244808  615
7  Used 244045   33
8  Used 245427  261
9  Used 245423  461
10 Used 244983 1194

I want a scatterplot of the Size values grouped by the Type column.
I also want 2 lines showing each group's "average".

> library(ggplot2)
> data <- read.table("mem.dat", header=T, sep=",")
> attach(data)
> ggplot(data.frame(Type, ID, Size), aes(x=ID, y=Size, shape=Type, color=Type))
    + geom_point(shape=1) + scale_fill_hue(l=40)
    + geom_line(stat="hline", yintercept=mean, linetype="dashed")
>

Regards,
Alan

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