**Analyze g
Full Width Half
Max**

Calculates the full width half max distance of a peak, and displays the results on the graph in a new data set with data set text.

*The calculated result is more accurate
than the resolution of your plot!*

** g
Automatic
**Searches your plot for the
highest Y value and assumes this as the correct peak position. If you draw a
rectangle before selecting FWHM only the part of your plot within the rectangle
will be searched. Use this if your plot contains multiple peaks.

** g
Manual
**Preferred for noisy peaks: the Y value of the peak is determined by
clicking on it. You have to do
this

The X value of your last click will be the starting point from where the program will go down both legs of the peak. This doesn't need to be as precise as the Y value, just as long as it falls within the area of the half max distance line.