panel.parallel: Default Panel Function for parallel
Description
This is the default panel function for parallel.Usage
panel.parallel(z, subscripts, col, lty, ...)
Arguments
z
The data frame used for the plot.
subscripts
The indices of the rows of z that are to be
    displyed in this panel.
col, lty
graphical parameters (chosen by default as the settings
    for superpose.line).