This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Gaussian d.svg GNU Octave source code graphicstoolkit gnuplot force use of gnuplot backend instead of FLTK for plot Generates smaller SVG file meshgrid smaller step size increases resolution and smoothness but increases file size exp surf view shading flat remove edge lines on plot but keep color patches print 'Gaussiand