station: the individual gravity station name
lon: station Longitude, WGS84
lat: station latitude, WGS84
HAE: height above ellipsoid [meter]
x: UTM Easting, NAD 83
y: UTM Northing, NAD 83
obs: observed gravity
err: gravity measurement error [mGal]
iztc: inner zone terrain correction [mGal]
oztc: outer zone terrain correction [mGal]
FA: free air gravity
SBGA: Bouguer horizontal slab
CBGA: Complete Bouguer anomaly
Provider: the original data provider