contact_id probe_id impedance impedance_unit x y z xyz_units material con0 pro1 12 MΩ -0.2 0.2 4.97 mm 1.5% (w/v) neurobiotin (Vector Laboratories, Burlingame, CA,USA) and 2% (w/v) NaCl con1 pro1 12 MΩ -0.2 0.2 4.97 mm 1.5% (w/v) neurobiotin (Vector Laboratories, Burlingame, CA,USA) and 2% (w/v) NaCl con2 pro1 12 MΩ -0.2 0.2 4.97 mm 1.5% (w/v) neurobiotin (Vector Laboratories, Burlingame, CA,USA) and 2% (w/v) NaCl