An electrical connector includes an insulative housing retaining a plurality of first contacts and second contacts. At least some of the illustrative embodiments include: obtaining a plurality of values indicative of characteristics of an underground formation; and plotting the plurality of values on an output device of a computer system. Then, the encoded gathers are summed by summing all traces corresponding to the same receiver from each gather, resulting in a simultaneous encoded gather. Recessed portions and raised securement hubs may be formed during the molding process.