Table 2: Sidereal angular velocity (in deg/day) derived from the local tracking for magnetic field ( $\Omega _{\rm B}$ ) and for horizontal divergence maps ( $\Omega _{\rm div}$ ).
Serie Type # cells $\Omega _{\rm B}$ $C_{\rm B}$ $\Omega _{\rm div}$ $\Delta\Omega_{\rm div}$ $C_{\rm div}$

January 1997 Div 4979 $14.18\pm0.01$ 0.79 $14.35\pm0.07$ $0.26\pm0.07$ 0.73

March 1997 Div 1622 $14.02\pm0.02$ 0.72 $14.40\pm0.13$ $0.47\pm0.13$ 0.73

January 1997 Conv 5327 $14.19\pm0.01$ 0.80 $14.38\pm0.07$ $0.30\pm0.06$ 0.73

March 1997 Conv 1775 $14.03\pm0.02$ 0.73 $14.67\pm0.12$ $0.61\pm0.12$ 0.73

**Table 2:** Sidereal angular velocity (in deg/day) derived from the local tracking for magnetic field ( $\Omega _{\rm B}$ ) and for horizontal divergence maps ( $\Omega _{\rm div}$ ).
Serie	Type	# cells	$\Omega _{\rm B}$	$C_{\rm B}$	$\Omega _{\rm div}$	$\Delta\Omega_{\rm div}$	$C_{\rm div}$
January 1997	Div	4979	$14.18\pm0.01$	0.79	$14.35\pm0.07$	$0.26\pm0.07$	0.73
March 1997	Div	1622	$14.02\pm0.02$	0.72	$14.40\pm0.13$	$0.47\pm0.13$	0.73
January 1997	Conv	5327	$14.19\pm0.01$	0.80	$14.38\pm0.07$	$0.30\pm0.06$	0.73
March 1997	Conv	1775	$14.03\pm0.02$	0.73	$14.67\pm0.12$	$0.61\pm0.12$	0.73

Source LaTeX | All tables | In the text