Bar chart labels

I’m creating simple bar chart. Here you can see my source data for barchart.

But resulting chart doesn’t show all labels however all of them are only 1 letter and there is a room to place it. Is there anything I can do about it?

image

I solved it by passing extra parameters in json. gridCount is how many bars we have in our chart.
{
“categoryAxis”: {
“autoGridCount”: false,
“gridCount”: 13
}
}