[R] problem with PCA loading plot

[Fireblast]

Hi,

I am a beginner with R. I would like to get a loading plot of PC 3 vs PC 1.

For PC 1 vs PC 2 I use 

library(pls)
loadingplot(pca.result, comps = 1:2, scatter = TRUE, labels="names")


if I try

loadingplot(pca.result, comps = 1:3, scatter = TRUE, labels="names")

I get the loading plots of PC 1 vs PC 2, PC 1 vs PC 3 and PC 2 vs PC 3. What
do I have to do to get just a single loading plot of PC 3 vs PC 1.

Thanks for your help in advance !
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