Table 3 Description of data channels in original data set.
Channel	Name	Units	Description
1	record id	-
2	flight	m	flight number
3	x utm	m	UTM easting1
4	y utm	m	UTM northing
5	altr	ft x 10	radar altimeter
6	cxi900	ppm x 10	992 Hz VCX coil-pair inphase2
7	cxq900	ppm x 10	992 Hz VCX coil-pair quadrature
8	cpi900	ppm x 10	874 Hz HCP coil-pair inphase3
9	cpq900	ppm x 10	874 Hz HCP coil-pair quadrature
10	cxi5000	ppm x 10	5655 Hz VCX coil-pair inphase
11	cxq5000	ppm x 10	5655 Hz VCX coil-pair quadrature
12	cpi7200	ppm x 10	7342 Hz HCP coil-pair inphase
13	cpq7200	ppm x 10	7342 Hz HCP coil-pair quadrature
14	cpi56k	ppm x 10	55780 Hz HCP coil-pair inphase
15	cpq56k	ppm x 10	55780 Hz HCP coil-pair quadrature
Table 3 continued
16	res56k	ohm-m	56-kHz HCP apparent resistivity
17	res7200	ohm-m	7200-Hz HCP apparent resistivity
18	res900	ohm-m	900-Hz HCP apparent resistivity
19	dp56k	m	56-kHz differential resistivity depth
20	dp7200	m	7200-Hz differential resistitivity depth
21	dp900	m	900-Hz differential resistivity depth
22	cen56k	m x 10	56-kHz centroid (Sengpiel) depth
23	cen7200	m x 10	7200-Hz centroid (Sengpiel) depth
24	cen900	m x 10	900 Hz centroid (Sengpiel) depth
25	ddep56k	m	56-kHz differental resistivity depth
26	ddep7200	m	7200-Hz differential resistivity depth
27	ddep900	m	900-Hz differential resistivity depth
28	dres56k	ohm-m	56-kHz differential resistivity
29	dres7200	ohm-m	7200-Hz differential resistivity
30	dres900	ohm-m	900-Hz differential resistivity
31	cxs	ppm	coaxial sferics channel
32	cxpl	pmm	coaxial power line monitor
33	cps	ppm	coplanar sferics channel
1UTM coordinates are given in NAD83 and are in zone 17. 2All VCX channels are in true ppm. 3All HCP channels are in Dighem ppm. To obtain true ppm for the HCP channels, multiply the Dighem value by 2.

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