Plot vitamin D status curves.
# S3 method for vitd.curve
plot( x, main = " ", xlab = " ", ylab = "25-hydroxyvitamin D",
col=1:6, add = FALSE, ylim = NULL, ... )
An object of class vitd.curve.
Main title for the plot.
A title for the x-axis.
A title for the y-axis.
A vector of colours for the plotted status curves.
If TRUE, add to current plotting window
Gives the plotting limits on tye y-axis.
Additional arguments to the plot function.
Rebecca Mangan and Jason Wyse