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De Haas-van Alphen (dHvA) and Shubnikov-de Haas (SdH) oscillations of theorganic metal $\theta$-(BETS) 4 CoBr 4 (C 6 H 4 Cl 2) are studied in magneticfields of up to 55 T at liquid helium temperatures. In line with Fermi surfaces(FS) illustrating the linear chain of coupled orbits, the observed Fouriercomponents are linear combinations of the frequencies linked to the two basicorbits $\alpha$ and $\beta$, which have small effective masses compared toother organic metals with the same FS topology. Analytical formulas based on asecond order development of the free energy within the canonical ensemble, notonly account for the field and temperature dependence of the dHvA amplitudesbut also for their relative values. In addition, strongly non-Lifshitz-Kosevichbehaviours are quantitatively interpreted. In contrast, Shubnikov-de Haasoscillations are not accounted for by this model. short title: Quantumoscillations of $\theta$-(BETS) 4 CoBr 4 (C 6 H 4 Cl 2)

Quantum oscillations of a linear chain of coupled orbits with small effective masses: the organic metal $\theta$-(BETS) 4 CoBr 4 (C 6 H 4 Cl 2 )