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. 2013 Oct 23;8(10):e77102. doi: 10.1371/journal.pone.0077102

Figure 2. Gravity and magnetic anomalies of the test region crossed by the pigeons.

Figure 2

(A) Gravimetric anomalies, the change of the gravity intensity (ΔGB – Bouguer, mGal = milligal); (B) Horizontal gravity gradients (E = Eötvös), highest values mark locations with steepest gradient of gravimetric values in border zones of gravimetric anomalies. (C) Magnetic anomaly map (nT). The square symbols indicate the release sites: Pologi, the experimental release site; TZ, the last training flight to Zavallia loft; and TS, the last training flight to Savran loft. Black lines indicate beelines from the experimental release site to the Z- loft (46 km) and the S-loft (54 km).