Hi Ellie,
The standard heat map accepts an xy grid for the values - you may need to use something like the triangulated series which accepts arbitrary values for this purpose. Can you post some sample data that you want to show? 

Best Regards,
Nevron Support Team

Hello! I am trying to implement a heat map,but my dataset has the the format ([range],[range],z). Is it possible to give range values to x and y axes as an input instead of distinct values?

Thank you!