ContourLabels

is an option for contour plots that specifies how to label contours.

Details

	None	no labeling
	Automatic	label with tooltips only
	True	label with text only
	All	label with text and tooltips
	f	label with f[x,y,z]
	{f,g}	use g as a tooltip for the complete contour

With ContourLabels->f, the label can be any expression or graphic, and can include constructs such as Tooltip.
ContourLabels->{f,g} uses f[x,y,z] as an explicit displayed label, and uses g[x,y,z] as a tooltip for each complete contour line.
The positions of contour labels are determined automatically to optimize readability.

Automatically label contour lines with tooltips:

Label with tooltips and text:

Customize the appearance of the labels:

Top