[R] Plot creates a straigth line

[1Rnwb]

Hello all, I am using 'plot' to create standard curves for elisa data. when I
use 'plot' with type='b' i get the points connected with lines and one
straigth line from the lowest datapoint to the highest data point. how can i
avoid/remove it from the figure. i am using R2.9.1, below is the example of
the data.

od<-c(10, 8, 6,4,2,1, 10.5,7.8,6.4,3.8,2.1,0.95)

cyto_conc=2650				# Highest cytokine concentration user defined

cyto_std_conc <-c(cyto_conc)

for (i in 1:5)
     {
	cyto_conc = cyto_conc /3
	cyto_std_conc <-c(cyto_std_conc ,cyto_conc)
     }
cyto_std_conc<-log2(rep(cyto_std_conc,2))
cyto<-cbind(cyto_std_conc,od)

plot(cyto_std_conc,od, type='b')

I have searched help using '?plot' in R as well as google, all the examples
which are available online gives me the plot the way it is shown in the
example. but when i use the plot for my data it gives me a straight line.
thanks
sharad
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