[R-SIG-Finance] How to add data to secondary axis in chartSeries

[Robert A'gata]

Hi,

I'm wondering if it is possible to add data to secondary axis in the
main panel in chartSeries. For example, I have a signal that is
correlated with the price but of different scale. I'm wondering if
there's any possibility at all? And how to do it?

Secondly, I'm wondering how to delete the "Last" legend that shows up
in the main panel? Thank you.

Bests,

Robert