**Table 2:** Historic pulsar periods, corrected for binary doppler shift. The errors given for the corrected periods are taken from the errors given for the observed periods (except for the value marked^a).
Date	Obs. period	Corr. period	Orb. phase	Instrument	Reference
[MJD]	[s]	[s]
43 755.2	38.218	38.2393 (40)	0.34	HEAO A-2	White & Pravdo (1979)
44 110.2	38.019	38.0424 (90)	0.32	Einstein MPC	Parmar et al. (1980)
45 535	37.885	37.8671 (90)^a	0.69	Tenma GSPC	Nagase et al. (1984)
47 237.5	37.747	37.7289 (10)	0.63	Ginga LAC	Kamata et al. (1990)
47 258.5	37.725	37.7058 (10)	0.64	Ginga LAC	Kamata et al. (1990)
47 589.5	37.713	37.7355 (30)	0.32	Ginga LAC	Kamata et al. (1990)
47 977	37.853	37.8652 (200)	0.41	SIGMA	Mereghetti et al. (1991)
48 305	37.7897	37.7621 (3)	0.81	ART-P	Sunyaev et al. (1991)
48 490	37.6726	37.6707 (15)	0.51	SIGMA	Sunyaev et al. (1991)
50 683.954		37.347411 (6)^b		RXTE	Baykal (2000)
50 708.5	37.39	37.3649 (100)	0.85	ASCA	Audley et al. (2006)
51 950.84	37.329	37.3019 (200)	0.75	Chandra HETGS/ACIS-S	Chakrabarty et al. (2002)

^a Averaged over 5 days, resulting in an increased error; ^b published value already corrected
for binary motion, $\dot{P}=+(4.56\pm 0.13)\times 10^{-9}$ s s^-1.

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