Argument values (@argvals):
         Min. 1st Qu. Median Mean 3rd Qu. Max.
Dim. 1 :    1       2      3    3       4    5

Observed functions (@X):
         a  b  c  d
Min.     1  2  3  4
1st Qu.  5  6  7  8
Median   9 10 11 12
Mean     9 10 11 12
3rd Qu. 13 14 15 16
Max.    17 18 19 20

