To reset all the chart parameters to the current defaults:

chReset

This may be used in conjunction with chNewCell as this leaves all options unchanged on the assumption that you are plotting a series of small multiples which should all have the same settings. An alternative would be to set the trellis-style as ‘reset’ here.

See also ...
chNewCell – advance to next cell in trellis
TrellisStyle – trellis style