How to invert Wenner, Schlumberger, or other arrays with UBC-GIF's DCIP2D

Wenner and Schlumberger arrays are not recognized by the UBC-GIF graphical
interface. It can not display raw data (pseudosections), and it can not build a
mesh for you. Here is what to do.

First make your own mesh file using a text editor. Instructions are in the
manual under the heading "fdmesh.dat".  Then build a data file according to the
manual, and include estimates of error for each datum (don't forget that data
are normalized potentials not apparent resistivities). You must put "dipole-
dipole" on the second line of the data file so the program thinks it is working
with dipole data. If you get sign errors, try changing swapping the transmitter
(or receiver) electrode columns. When the data set is specified according to
the manual the inversion should run fine. Resulting models and log files are
all normal, and the user interface is quite happy reading the resulting model
because it is just a mesh of cells like any other 2D solution.