Table 2: Pulse periods (P) and the upper limits on its first derivatives ( $\dot P$ ).
name Reference time^* [MJD] P [s] $\left\vert\dot P\right\vert^{**}$ [s/s]

H1 52 796.00566 296.78 $\pm 0.04$ < $7 \times 10^{-6}$

H2 52 824.25522 296.62 $\pm 0.02$ < $6.5 \times 10^{-7}$

EI 53 154.80607 296.698 $\pm 0.003$ < $4 \times 10^{-9}$

H3 53 167.38765 296.69 $\pm 0.01$ < $1.8 \times 10^{-7}$

^* At the reference time the pulse profile has a minimum in the 15-35 keV energy range.
^** Upper limits are given at the $2\sigma$ confidence level.

**Table 2:** Pulse periods (P) and the upper limits on its first derivatives ( $\dot P$ ).
name	Reference time^* [MJD]	P [s]	$\left\vert\dot P\right\vert^{**}$ [s/s]
H1	52 796.00566	296.78	$\pm 0.04$	< $7 \times 10^{-6}$
H2	52 824.25522	296.62	$\pm 0.02$	< $6.5 \times 10^{-7}$
EI	53 154.80607	296.698	$\pm 0.003$	< $4 \times 10^{-9}$
H3	53 167.38765	296.69	$\pm 0.01$	< $1.8 \times 10^{-7}$

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