Table 2: Groups of data considered for methods that constrain quantities related to $\frac{\Delta \alpha}{\alpha}$.
Method Redshift or redshift interval Quantity measured $\frac{\Delta \alpha}{\alpha} \pm \sigma$ Reference
(1) (2) (3) (4) (5)
Optical and radio lines 0.23 < z < 2.4 $\alpha ^2g_{\rm p}\frac{m_e}{m_p}$ $0.32\pm0.50$ (1)
Molecular and radio lines z=0.69 $\alpha ^2g_{\rm p}$ $-0.08 \pm 0.27$ (2)
OH conjugate lines and radio lines z=0.765 $g_{\rm p} \left({\frac{\alpha^2 m_{\rm e}}{m_{\rm p}}}\right)^{1.57}$ $0.27\pm0.27$ (3)
OH conjugate lines and radio lines z=0.685 $g_{\rm p} \left({\frac{\alpha^2 m_{\rm e}}{m_{\rm p}}}\right)^{1.57}$ $0.11 \pm 0.13$ (3)
Notes. The observational methods consist in comparing the redshift obtained with different spectral lines. Columns: (1) observational method specifying which lines are compared; (2) redshift or redshift interval; (3) quantity measured; (4) mean value of $\frac{\Delta \alpha}{\alpha}$ and its corresponding $1 \sigma$ error; (5) reference. References: (1) Tzanavaris et al. (2007); (2) Murphy et al. (2001a); (3) Kanekar et al. (2005).

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