Argument values (@argvals):
        Obs 1 Obs 2 Obs 3
Min.        1   2.0   3.0
1st Qu.     2   2.5   3.5
Median      3   3.0   4.0
Mean        3   3.0   4.0
3rd Qu.     4   3.5   4.5
Max.        5   4.0   5.0

Observed functions (@X):
        Obs 1 Obs 2 Obs 3
Min.        1   2.0  -3.0
1st Qu.     2   2.5  -2.5
Median      3   3.0  -2.0
Mean        3   3.0  -2.0
3rd Qu.     4   3.5  -1.5
Max.        5   4.0  -1.0

