Fig. 3From: Reductive dissolution of biogenic magnetiteFirst-order reversal curve (FORC) results for samples from seven depth horizons shown in Fig. 2, indicating a FORC diagrams, b the central ridge component extracted from the respective FORC diagrams (Egli et al. 2010), c profiles of magnetostatic-interaction field (Hu) distributions at a coercivity (Hc) of 40 mT: the central-ridge component (blue), the background component with vertical spread (black), and the total of the two (red), and d profiles of coercivity distributions at zero interaction field (Hu = 0): the central-ridge component (red) and the total (black)Back to article page