Thank you Vishwas,

Your solution did work. I have applied to the Y-axis of my chart and it works fine.
(My Y-axis is numeric.)
I have tried it on the X=axis as well, but that did’t work.
X-axis is a dateTime=scale. (intervalType = “hour” and interval is 24.)
I want to get a minorgridline every 6th hour.

Is that possible?

Regards,
Leo