Use these options in ax_plotOptions.

heatmap_opts(radius = NULL, enableShades = NULL,
  shadeIntensity = NULL, colorScale = NULL, ...)

Arguments

radius

Numeric. Radius of the rectangle inside heatmap.

enableShades

Logical. Enable different shades of color depending on the value

shadeIntensity

Numeric [0,1]. The intensity of the shades generated for each value.

colorScale

List.

...

Additional parameters.

Note

See https://apexcharts.com/docs/options/plotoptions/heatmap/.