5.5.9.10. DOE contour plot

ContourPlot: Make a contour plot of a function—Wolfram Documentation

Crosshairs and flags - Minitab

ContourPlot: Make a contour plot of a function—Wolfram Documentation

ContourPlot: Make a contour plot of a function—Wolfram Documentation

Contour plot of the 5D PES as function of R, ✓ for fixed ✓ 0 = ' = ' 0

Stat-Ease » v11 » Tutorials » Response Surface (pt 3)

SAS Help Center: Example: Create a Contour Plot

Use R to recreate contour plot made in Igor - Stack Overflow

ContourPlot: Make a contour plot of a function—Wolfram Documentation