Statistics
Normal Distribution
f = 1/(σ√2π) · e^(-x²/2σ²)

The Gaussian bell widening and flattening as its standard deviation grows — area stays 1.
Computed & rendered in pure C# on the frozen OnlyCSharp 1.8 library — animation baked to GIF with the library's own
Gif encoder (no GPU, no ffmpeg, no external packages).