Display x,y,z coordinates of multiple, selected vertices?

Hello everybody,
I was wondering if it is possible to display the x,y and z coordinates of multiple, selected vertices within the viewport?

I don’t mean showing a single coordinate in the property shelf, but something similiar to the Add-on “Measure-panel” (see image). This comes fairly close but in this example it only shows the coordinates for the relation between the 3D-cursor and a single selected vertex.

Would it be difficult to modify the script for it to show just the x,y,z coordinates ?