[R] how to select column wich median is in this interval [5;6]

[ikuzar]

Hello, 
I have got a data frame df like this :
> df
   e1 e2 e3 e4
1   1 11  1 21
2   2 12  2 22
3   3 13  3 23
4   4 14  4 24
5   5 15  5 25
6   6 16  6 26
7   7 17  7 27
8   8 18  8 28
9   9 19  9 29
10 10 20 10 30

where e1 ... e3 are vectors
I have to select columns which median is in the interval [5;6] ( Here, for
instance, e1 and e3)
I would not want to use loop... (for, while)

I search for smthing like this : 
e_candidates = df[, ]
But I do not know how to write the condition, 

Thanks for your help

Thanks for your help
I'd like to know how to select 

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