Table 1: Free parameters that may vary per burst.
Parameters Note

n The power-law index for the variation

of the magnetic field on the disc

$\tau _{\rm pre}$ Precession period

$R_\Omega \equiv \Omega _{\rm nu} / \Omega _{\rm pre}$ Frequency ratio of nutation to precession

$\theta _{\rm jet}^0$ Initial angular coordinate of a jet

$\theta _{\rm obs} ,\phi _{\rm obs}$ Observation angles

**Table 1:** Free parameters that may vary per burst.
Parameters	Note
n	The power-law index for the variation
	of the magnetic field on the disc
$\tau _{\rm pre}$	Precession period
$R_\Omega \equiv \Omega _{\rm nu} / \Omega _{\rm pre}$	Frequency ratio of nutation to precession
$\theta _{\rm jet}^0$	Initial angular coordinate of a jet
$\theta _{\rm obs} ,\phi _{\rm obs}$	Observation angles

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