AspectRatio is an option for Show and related functions which specifies the ratio of height to width for a plot.
AspectRatio determines the scaling for the final image shape.
AspectRatio -> Automatic determines the ratio of height to width from the actual coordinate values in the plot.
The default value AspectRatio -> 1/GoldenRatio is used for two-dimensional plots. AspectRatio -> Automatic is used for three-dimensional plots.
See Section 1.9.2, Section 1.9.6, Section 2.10.2 and Section 2.10.4.
See also: BoxRatios, PlotRegion.
New in Version 1.