English: "a, Contour plot for typical gravity gradient signal sizes in various applications, contours in eötvös for density contrasts of 1.8 g cm−3. The parameters of the detected feature (red dot) and the statistical uncertainty of the sensor (solid line) are shown. Features in the region above the solid line are detectable with current uncertainty. b, A perspective of future gravity cartography being used with 0.5 m spatial resolution over a region, at an uncertainty level of 20 E. Expected signal sizes for a range of applications are shown."