How can I label the peaks of a line in picture?

[dec04009]

Hello,My friends! My question is

I use XY picture  VI  to plot a line, I found the peaks in this line and I want to

label these peaks with marks(circle, cross etc). How can I   realize this function?

I used to use the mouse to label the peaks in Graph Plot VI, but I have no idea

with the picture VI

Another question is for picture, we can save it automatically to disk with the specified

path? but for graph plot, is there a way to save to disk automatically?

Any reply will be appreciated, many thanks!