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Table 1:

Best-fit orbital solution for SAX J1808.4-3658 derived from the analysis of the five outbursts observed from 1998 to 2008.
Parameter Units Value
T*1998 MJD 50 914.79452952(85)
$P_{{\rm orb}}$ s 7249.156444(23)
$\dot{P}_{{\rm orb}}$ 10-12 s/s 3.89(15)
$a_1 \sin i / c$ s 0.0628106(20)
e   < $1.2 \times 10^{-4}$
$\nu_{2008}$ Hz 400.9752084532(17)
T*2008 MJD 54 739.98342965
Note: errors are at $90\%$ c.l. on the last 2 digits. The upper limit on the eccentricity is at $95\%$ c.l. The values of $P_{{\rm orb}}$ and $\dot{P}_{{\rm orb}}$ are referred to  T*1998, while the value of $\nu_{2008}$ is referred to  T*2008.

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