Table 1 The frequencies and the cyclotron masses of the quantum oscillations in ZrTe₅

F_z	m_∗,z	\({\tilde{\varepsilon }}_{{{{\rm{F}}}}}\)	F_x	m_∗,x	\({\tilde{\varepsilon }}_{{{{\rm{F}}}}}\)	F_y	m_∗,y	\({\tilde{\varepsilon }}_{{{{\rm{F}}}}}\)	ϵ_yx
T		meV	T		meV	T		meV
5.3	0.034	36.1	55.2	0.266	47.9	32.4	0.16	46.9	0.587

The frequencies F_i and the cyclotron masses m_∗,i (measured in the units of the free-electron mass) correspond to the magnetic fields directed along the axes i = x, y, z of the crystal. The values of F_i are found from Fig. 4e, f in the paper of Yuan et al.¹², and Fig. 5b ^a presented there gives m_i. For each pair F_i, m_∗,i, the ratio \({\tilde{\varepsilon }}_{{{{\rm{F}}}}}\) is calculated with Eq. (7); ϵ_yx = F_y/F_x here.
^aAccording to Fig. 5b in the work¹², the accuracy of the determination of m_∗,z is about 15%, whereas a possible error for m_∗,x and m_∗,y is near 5%.

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