If you select the plot window and click on File > Save then the plot will be saved as an image. If you click on the Save… button of the plot window, you will save the data points as .XLS. I’m not sure I understood what you want to do, but these are the only options you have.
If you click on the List button, they results will be shown on a another window.
That is because your selection takes some pixels out of the object and therefore the distance is NaN. You might want to reduce the selection by 1 (using Enlarge with value -1):
What do you mean? The values will show up in an arbitrary order (most probably starting from the most upper left position and then continuing in the line.