# Curve (and Surface) Smoothing

These are the available functions for curve (and surface) smoothing. See each function's help topic in the TERR Language Reference for more information.

Function name | Title description
--- | ---
`density` | Kernel Estimate of Probability Density Function
`density.default` | Kernel Estimate of Probability Density Function
`lowess` | Scatter Plot Smoothing
`predict.smooth.spline` | Smoothing Spline at New Data
`smooth` | Nonlinear Smoothing Using Running Medians
`smooth.spline` | Fit a Smoothing Spline
`supsmu` | Scatter Plot Smoothing Using Super Smoother