You can do what you are asking using the axis settings.
- Create your histogram
- Right click on the axis and select "axis settings..." In the lower right of the settings dialog there is an area called "reference lines."
- Select the check box labeled "allow ranges."
- For +1 Std Dev you would enter the mean of the distribution in the min value field, and the std deviation value in the max value field.
- Give it a label and pick a color you like. The percentage field beside the color field adjusts the transparency of the range marker that will appear.
- Click add to get a preview of what it will look like at the bottom of the dialog menu.
- Repeat with any other ranges you want.
- Click OK
Best,
M
