ggplot object not found error when adding layer with different data
<p>I have a plot with some points and I'd like to use segment to connect them</p>

<pre><code>dummy = data.frame(GROUP=c("A","B","C","D"),
                   X = c(80,75,68,78),
                   Y=c(30, 32,36,33)

)
df= data.frame(x1 = c(80), x2 =c(78) , y1=c(30), y2 =c(33))
df
library(ggplot2)
ggplot(dummy,aes(x=X,y=Y,color=GROUP)) + 
  geom_point() +
  geom_segment(aes(x=x1,y=y1,xend= x2, yend =y2), data = df) 
</code></pre>

<p>but I get this error </p>

<pre><code>Error in eval(expr, envir, enclos) : object 'GROUP' not found
</code></pre>

<p>What am I doing wrong here?</p>