examples of DC underground

[lheagy]

We need a couple images and a synthetic example to demonstrate DC resistivity underground.

• @sdevriese, @micmitch : do you have a couple examples of images / data that can demonstrate this?

For the synthetic example, a single example showing the non-uniqueness of it the target is above (eg. at location a) or below (eg. at location b) in a line of data. @micmitch : do you have an example showing this?

[lheagy]

thanks @micmitch, @sdevriese!