# 2D Probability Density Map with tikz

I want to draw a 2D probability density map diagrammatic sketch using tikz.

However, I can not find similar example online. Is it possible to draw similar figures using tikz? Thanks!

You can use the pgfplots package to easily produce such plots in tikz:

\documentclass{book}
\usepackage{pgfplots}

\begin{document}

\begin{tikzpicture}
\begin{axis}[view={0}{90}]