Problem in grid chart

[#1]

Hi,

I want to make a grid chart, based on a calculated dimension.

I have a list of persons :

[CODE]

Person:
LOAD * INLINE [
Age, Sexe, Nom
18, F, Sabrina
18, M, Kevin
19, M, Simon
21, F, Vanessa
21, F, Muriele
21, F, Samantha
21, M, Mickael
30, M, Bob1
30, M, Bob2
30, M, Bob3
30, M, Bob4
30, M, Bob5
30, M, Bob6
30, M, Bob7
30, M, Bob8
];

[/CODE]

I want to make a chart having in x-axis the age, and in the y-axis the count of person having this age.

My problem is that I don't know how to display the other values in the scale.

At first, my chart looked like this :

Having the same space between "18" and "19" than between "21" and "30".

I managed to display all the ages with this code :

TmpTable:
LOAD max(Age) AS tmp_max,
min(Age) AS tmp_min
RESIDENT Person;
LET maxAge = peek('tmp_max', 0, 'TmpTable');
LET minAge = peek('tmp_min', 0, 'TmpTable');
DROP TABLE TmpTable;



LstAges:
LOAD
$(minAge) + RowNo() - 1 AS Age
AUTOGENERATE 1
WHILE IterNo() <= $(maxAge) - $(minAge);

That gave me the following chart :

I don't want to use the same trick for the count of ages, because it's in my real project a very complex set analysis formula I cannot compute in the loading script.

How can I say to the graph "display all values (1 to 😎 in the y-axis" ?