abline-RobReg-method: Add line to plot
In depthproc: depthproc

Add fitted line to a plot. This is overloaded function for robust regression methods from package depthproc.

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## S4 method for signature 'RobReg'
abline(a = NULL, b = NULL, h = NULL, v = NULL,
  reg = NULL, coef = NULL, untf = FALSE, ...)

`a`	an object of class RobReg
`...`	Arguments to be passed to methods, such as graphical parameters (see par).
`h`	the y-value(s) for horizontal line(s).
`v`	the x-value(s) for vertical line(s).
`reg`	an object with a `coef` method. See ‘Details’.
`coef`	a vector of length two giving the intercept and slope.
`untf`	logical asking whether to untransform. See ‘Details’.