Milsy1,

I have no idea what JD is talking about... The images you refer to that in report are frorm the original 2003 airborne E/M data. It says E/M data right on the bottom of the image.

The squiggley lines simply represent the relative strength of the E/M signature (how much of an E/M anomaly there is) at those particular locations on the grid. The higher the E/M anomaly, the more squiggely the lines, and the more conductivity that is being registered - its a simple as that.

 The dashed line is something either the geophysicist or a geoologist drew on the image tracing the main trend of the E/M anomaly - nothing more.

The  E/M anomalies derived from the airborne geophyics data  are different than the magnetic anomalies - the former are conductive signatures, and the latter either postive or negative magnetic signatures. 

See my earlier post on geophysics for more info: http://www.agoracom.com/ir/Noront/messages/635238

Regards,

B.