What is the name of the variable of columns from the “Columns filter” out (in R) with KNIME ?

Hi everybody!

I have this workflow :

I choose my columns filter and I have this in out :

I would like to choose the columns Day and Temperature only but i don't what is the variable. 

I know for having the data of out of Column filter, it's 

rOut<-kIn

But I would like to choose the columns to manipulate them

Thank you for your answer